An isotope of sodium (Na) has a mass number of 22 it have 11 neutrons
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. protons are the positively charged particles which are present in the nucleus of an atom. a neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. here sodium (Na) has a mass number of 22 so, in that sodium 11 proton are present and 11 neutron are present.
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What is the classification of an instrument that makes sound from the substance itself?.
The classification of an instrument that makes sound from the substance itself is Idiophones.
What are instruments?Instruments are objects that are used in labs and music classes. They are the main items that help in doing work in those classes and labs. Instruments are made with technical knowledge and help in technical things.
The idiophone is an instrument that produces sound by vibrating the plates of the instrument. Under this, the instrument produces voices by themselves.
Thus, Idiophones are a type of instrument that produces sound using the substance itself.
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which contains the most amount of energy an aluminum can at 30C or an aluminum can at 20C
Answer:
The can at 30 degrees had more energy.
Explanation:
Since Heat is a type of energy, and the first can (30C) is hotter than the second can (20C) you can see that it has more energy. Energy is related directly to heat.
The aluminum can at 30 degrees had more energy.
What is energy?Energy is defined as using physical or chemical resources to generate power, particularly to provide heat and light or operate machinery. People have figured out how to transform energy from one form to another and then use it to accomplish tasks, making modern civilization possible. Although energy can take on several forms, it cannot be created or destroyed.
Given that heat is a sort of energy and that the first can is hotter (30C) than the second can (20C), you can infer that the first can has more energy. You need to apply 0.90 J of heat in order to raise the temperature of 1 g of aluminum by 1 C. Under the same circumstances, the temperature of the aluminum varied less than that of the copper.
Thus, the aluminum can at 30 degrees had more energy.
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What two effects a soluble impurity usually has on the melting point of a compound.
The two effects a soluble impurity usually has on the melting point of a compound are increase or decrease in the melting point of the compound.
The temperature at which a substance transforms from a solid into a liquid is known as its melting point. Melting happens for a pure substance at a single temperature.
The more prevalent soluble contaminants are organic matter, sodium chloride, sodium sulphate, sodium carbonate, magnesium chloride, calcium chloride, calcium sulphate, and calcium bicarbonate.
A solid's melting point is lowered by impurities, which have an impact on it. This occurs because the majority of solids have some sort of crystal lattice structure that is held together by the strong ionic binding forces. Impurities interfere with this lattice structure, weakening the bonds when they are present. Because of the weakened nature of these linkages, the solid will melt at a cooler temperature.
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Matter is a substance that has ________.
Answer:
matter is substance that has mass.
Answer: Mass and Volume?
Explanation:
what should you be careful of when measuring the temperature of a liquid in a beaker
The precaution to be taken while measuring the temperature of a liquid in a beaker is applying proper heat balance and taking all the required precautions.
A beaker with an open top contains a sample of liquid. It exposes this sample to light. That liquid absorbs the light energy, turning it into heat energy. As a result, the liquid becomes warmer and evaporation is accelerated. As a result, there is less liquid in the beaker. Since it is well known that the surface temperature of a liquid, along with air movement above the liquid surface, is one of the dominant factors affecting evaporation, I want to measure the evaporation rate as a function of surface temperature.This can be done by applying a heat balance.Learn more about heat balance at:
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The pancreas releases _________ to buffer the ph of the stomach juices. a strong base to counter the strong acid pepsin nahco3 hcl atpase activating protein
The pancreas releases NaHCO₃ to buffer the pH of the stomach juices.
Balanced chemical equation for reaction of sodium hydrogen carbonate (NaHCO₃) and hydrochloric acid (main acid in stomach juices):
NaHCO₃ + HCl → NaCl + CO₂ + HCl.
Hydrogen carbonate mixed is used to neutralizes stomach acidity, it converts stomach acid (hydrochloric acid) to carbon dioxide.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
Other molecules cannot buffer the pH because there are bases or very strong acids.
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claudia performed a flame test in her lab. the result of her flame test is shown here. what scientific questions could claudia ask about the flame? check all that apply. what element causes this flame color? is this the prettiest flame color? will the flame color change if another element is added? will changing the temperature affect the flame color? which flame test does the class like the best?
The scientific questions Claudia can ask about the flame test are (A), (C), and, (D).
The flame test is used to find sure factors, which on heating deliver a particular colour to the flame.
clinical questions are extraordinary from regular questions as they've a prior goal and need to be testable.
a very good scientific question is absolutely reality-primarily based and may be answered through experiment or using previous evidence.
three principal kinds of clinical questions are Verification questions, size, or statement-based totally facts series, which include specific capabilities of an organism or phenomenon.
The clinical questions Claudia ask is-
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Explain how the variation in carbon skeleton contributes to diversity and complexity of organic molecules?
Carbon skeletons may vary in shape, length, number, location and strenght of covalent bonds between carbon atoms.
Element carbon is in group 14 of Periodic table of elements.
Electron configuration for carbon: ₆C 1s² 2s² 2p².
Valence electrons are in 2s and 2p orbitals. There is one pair of electrons in 2s orbital and two lone electrons in 2p orbital with the same electron spin.
A carbon atom has four covalent bonds with other carbon atoms in an organic compound.
Carbon also has different type of hybridization (sp, sp2 and sp3).
The strenght of carbon-carbon bond is approximately 350 kJ/mol.
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Ionic bonds are ___________ than covalent bonds and are ___________ common in cells.
Answer:
Ionic bonds are stronger than covalent bonds
Which observation most likely indicates that only a chemical change has taken place?(1 point)
The change cannot be reversed.
The shape changes
States of matter changes.
A reaction occurs.
The observation most likely indicates that only a chemical change has taken place the change cannot be reversed.
What is a Chemical change?
A chemical change is a change of one substance into another, the formation of new compounds with different properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or decomposition to form more substances).Burning, rusting, rotting, and frying are a few instances of chemical change. Boiling, melting, freezing, and shredding are a few examples of physical changes.When bonds between molecules or atoms are formed, disrupted, or both, chemical changes result. This implies that material is changed from one with a certain set of attributes (such as melting point, color, flavor, etc.) into another with a different set of properties.Hence, The observation indicates chemical change is the change that cannot be reversed.
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A chemical reaction in which bonds are created is usually associated with ________.
A chemical reaction in which bonds are created is usually associated with The consumption of energy
Consumption method using, shopping for, or consuming something. If we do not lessen our power intake, we are able to run out of fuel. Conspicuous intake is shopping for something to expose off. Consumption is associated with the verb consume, which means to eat, use, or buy.
There are four Consumption kinds of client goods. They are comfort goods, distinctiveness goods, purchasing goods, and unsought goods.
Consumption of Food intake is a periodic behavior. It is brought on at diverse moments of the day through some converging factors (time of day, want a state, sensory stimulation, social context, etc.).
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Crack is made by taking powdered cocaine hydrochloride and adding sodium bicarbonate and water. True or false
An a-t base pair consists of _____ h-bond(s); a c-g base pair consists of _____ h-bond(s).
An a-t base pair consists of 2 h-bond(s); a c-g base pair consists of 3 h-bond(s). The correct option is E.
What are base pairs?
Base pairs are the pairs that are made up of nucleotides. They are pairs of DNA bases. The base pairs are connected with each other by hydrogen bonds.
In between adenine and thymine, there are two or double hydrogen bonds present and between cytosine and guanine, there are triple bonds present.
So, there is 2 hydrogen bonds and triple hydrogen bonds in the base pairs of DNA, the genetic material.
Thus, the correct option is E, 2, 3.
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The question is incomplete. Your most probably complete question is given below:
A. 1, 2.
B. 2, 1.
C. 2, 2.
D. 3, 2.
E. 2, 3.
100 ml of a 0.1 mm buffer solution made from acetic acid and sodium acetate with ph 5.0 is diluted to 1 l. what is the ph of the diluted solution?
The pH of the diluted solution is 5.53.
Henderson–Hasselbalch equation for buffer solution:
pH = pKa + log(c(CH₃COO⁻)/c(CH₃COOH))
pH = 5.0 ⇒ c(H⁺) = 10⁻⁵ M
pKa = 4.75 ⇒ Ka = 1.78×10⁻⁵
log(cs/ck) = 5.0 - 4.75 = 0.25
c(CH₃COO⁻)/c(CH₃COO⁻) = 10∧(0.25) = 1.778
c(CH₃COO⁻) + c(CH₃COOH) = 0.1 mM
c(CH₃COO⁻) + c(CH₃COOH) = 1 × 10⁻⁴M
c(CH₃COOH) = 3.6x10⁻⁵ M; concentration of acetic acid before dilution
c(CH₃COOH) = 3.6x10⁻⁶ M; concentration of acetic acid after 10 times dilution
c(CH₃COO⁻) = 6.4x10⁻⁵ M; concentration of sodium acetate before dilution
c(CH₃COO⁻) = 6.4x10⁻⁶ M; concentration of sodium acetate after dilution
c(H⁺) = 10⁻⁶ M; concentration of hydrogen ions
After buffer solution is diluted to 1 l:
Ka = (c(CH₃COO⁻) + x) × (c(H⁺) + x) / (c(CH₃COOH) - x)
1.78×10⁻⁵ = (6.4x10⁻⁶ M + x) × (10⁻⁶ M + x) / (3.6x10⁻⁶ M - x)
x = 2.12×10⁻⁶ M
c(H⁺) = 10⁻⁶ M + 2.12×10⁻⁶ M
c(H⁺) = 3.12×10⁻⁶ M
pH = -logc(H⁺)
pH = -log3.12×10⁻⁶ M
pH = 5.53
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Water molecules are held together by hydrogen bonds because they are ___ molecules
Water molecules are held together by hydrogen bonds because they are polar covalent bond molecules.
The smallest particle of a substance has all the physical and chemical properties of that substance. A molecule is made up of one or more atoms. If they contain multiple atoms, those atoms can be the same (the oxygen molecule has two oxygen atoms) or different (the water molecule has two hydrogen atoms and one oxygen atom). Biomolecules such as proteins and DNA are made up of thousands of atoms.
A simple molecule contains only a few atoms joined by covalent bonds. An example is carbon dioxide (CO 2 ), whose molecule contains a carbon atom bonded to two oxygen atoms.
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Write the formula for each compound. capitalization and subscripts are graded. selenium tetrafluoride: oxygen difluoride:
The formula selenium tetrafluoride will be SeF4 and the formula of oxygen difluoride will be OF2.
In chemistry, compounds generally take prefixes and suffixes to signify the quantity of a particular atom in the molecule. For example, prefixes such as "tri-" could signify three atoms while prefixes such as "di-" could show two atoms. For suffixes, "-ide" could show anions that are nearly all electronegative.
Let's take the glance at the compound names step by step :
(a) Selenium tetrafluoride - As the compound has the prefix "tetra-" while fluoride method the appearance of a fluorine atom, we can write down the chemical formula as [tex]SeF_{4} .[/tex]
(b) Oxygen difluoride - Here we have second time the identical convention of the compound, now with the prefix di- which shows two fluorine atoms. The chemical formula will be here [tex]OF_{2}[/tex]
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A solution is made by dissolving 4.92 g of glucose (c6h12o6) in to 165 ml of water. the molality of this solution is ________ m, if the density of water is 1.00 g/ml.
The molality of this solution is 0.165 m.
m(glucose) = 4.92 grams; mass of glucose
V(water) = 165.0 mL; volume of water
d(water) = 1.00 g/mL; the density of water
M(glucose) = 180 g/mol; molar mass of glucose
n(glucose) = m(glucose) / M(glucose)
moles of glucose = mass of glucose / Molar mass of glucose
n(glucose) = 4.92 g / 180 g/mol
n(glucose) = 0.027 mol
m(water) = 1.00 g/mL x 165 mL
m(water) = 165 g = 0.165 kg
molality = number of moles / mass of water
b(solution) = 0.027 mol / 0.165 kg
b(solution) = 0.165 mol/kg; molality of the solution
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A certain compound contains 78.54% carbon and 21.46% hydrogen. How much carbon is in a 3.44 g portion of this sample?
Answer:
2.70 grams
Explanation:
78.54% of the compound is carbon, so in a 1 gram sample, there would be 0.7854 grams of carbon since 78.54% * 1 = 0.7854. Similarly, we multiple 78.54% by 3.44 to get the mass of carbon in a 3.44 gram sample.
78.54% * 3.44 = 0.7854 * 3.44 = 2.701776, but only leave 3 digits because otherwise it would be false accuracy
For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs ________.
When a substance exhibits liquid-crystalline qualities, the change from solid to liquid-crystalline state takes place at the solid's melting point.
What are liquid crystals?
The process of turning a liquid substance into a highly structured solid, with its atoms or molecules arranged in a well defined three-dimensional crystal lattice, is known as crystallisation.
A type of substance known as liquid crystal (LC) has qualities halfway between those of solid crystals and regular liquids. For instance, a liquid crystal's molecules may flow like a liquid while still having a crystal-like orientation.
Crystallized liquid. Liquid crystals are a type of substance known as liquid crystals (LCs) exhibits properties that fall somewhere between those of solid crystals and those of regular liquids. For instance, a liquid crystal's molecules may flow like a liquid while still having a crystal-like orientation.Thus, a substance exhibiting liquid-crystalline characteristics, the conversion from liquid-crystal occurs at the solid's melting point.
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Which type(s) of subatomic particles can be located within the nucleus of an atom? electrons only neutrons only protons and neutrons protons and electrons
The type of subatomic particles that can be located within the nucleus of an atom is protons and neutrons. The correct option is C.
What are subatomic particles?Subatomic particles are those particles that are present inside the atoms. These are present in different locations inside the atom. They are charged particles.
An electron is a negatively charged particle that rotates around the nucleus and a neutron is neutral, and a proton is a positively charged particle. Proton and neutrons are present inside the nucleus.
Thus, the correct option is C. protons and neutrons.
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B. how much of a 5.0 m naoh solution do you need to add to raise the ph to 6.09?
There are 0.037 NaOH will be needed to raise the pH 6.09.
Henderson equation, convey the pH of a buffer solution as a purpose of the concentration of the weak acid or base and the salt constituents of the buffer.
Formula of Henderson equation
pH = pKa + log10 ([A] / [HA])
Basic buffer has a basic pH and is get ready by blend a weak base and its salt with powerful acid.
According to Henderson equation pH of basic buffer is:
pH + pNaOH = 5.0
6.09 + pNaOH = 5.0
pNaOH = 5.0 - 6.09
pNaOH = log(1.09)
pNaOH = 0.037
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Acteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is:______
Bacteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is is the atmosphere.
The transformation of atmospheric Nitrogen N[tex]_{2}[/tex] into ammonia NH[tex]_{3}[/tex] which is a form that plants may use, is known as biological nitrogen fixation. However, eukaryotes do not engage in the process; it is exclusive to bacteria and archaea.
It has long been recognized that some archaea can contribute to the nitrogen cycling processes (albeit some of these organisms were not initially recognized as archaea). These included both assimilatory and dissimilatory activities, such as the fixing of atmospheric nitrogen. However, rather than large terrestrial or aquatic environments, these reactions were linked to extremophilic archaea that are generally found in 'exotic' habitats like hot springs or salt-saturated lakes.
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An atom is composed of a central nucleus which is surrounded by which orbiting particles? multiple choice question.
Electron are the orbiting particles, by which an atom is surrounded by.
What is electron?Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
An atom's nucleus is made up of electrons, protons, and neutrons. The positive charge of a proton balances out the negative charge of an electron. An atom is in a neutral state if its protons and electrons are equal in number.
They have a mass that is considerably lower, exist outside of the nucleus, and display both wave- and particle-like properties. Since an electron is also a fundamental particle, it is unreinforced and unbroken.
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What is the percent yield of a reaction in which 43.9 g of tungsten(vi) oxide (wo3) reacts with excess hydrogen gas to produce metallic tungsten and 9.60 ml of water (d= 1.00 g/ml)?
The percent yield of reaction of tungsten (vi) oxide with excess hydrogen gas to produce metallic tungsten and 9.60 mL of water is 101.25%
The balanced chemical equation of reaction is -
WO₃ + 3H₂ → W + 3H₂O
Given :
Mass of WO₃ = 43.9 g
Molar mass of WO₃ = 231.8 g/mol
Molar mass of H₂O = 18 g/mol
So,
Number of moles of WO₃ = Given mass
Molar mass
moles of WO₃ = 43.9 g = 0.18 mol
231.8 g/mol
Now, to calculate number of moles of H₂O, we use the balanced equation. From the equation,
1 mole of WO₃ reacts to give 3 moles of H₂O
So, 0.18 mole of WO₃ reacts to give 3 x 0.18 = 0.54 moles of H₂O
To calculate mass of H₂O,
Mass of H₂O = Moles x molar mass
= 0.54 mol x 18 g/mol
= 9.72 g
Therefore, the theoretical yield is = 9.72g
For actual yield,
Actual mass = density x volume (density =mass/volume)
= 1.00 g/mL x 9.60 mL
= 9.6 g
Therefore, the actual yield is 9.6 g
Now, for percent yield of reaction,
% yield = actual yield x 100
theoretical yield
= 9.72 x 100
9.6
= 101.25 %
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Which characteristic feature of the sternum should the nurse observe in a client with the diagnosis of pectus carinatum?
Frontward thrust the sternum of a patient with pectus carinatum protrudes forward, forcing the surrounding ribs to slant backward. In the funnel chest, the sternum and surrounding cartilages are visible. The natural anatomical location of the sternum is in the midline and in a straight posture. Barrell chest is characterized by a horizontal sternum and an elevated intercostal angle.
What is pectus carinatum?
The word "pectus carinatum" is used to describe a variety of aberrant protrusions of the front chest wall. Depending on where the deformity is most prominent, it can be either chondrogladiolar or chondromanubrial. Additionally conceivable are lateral abnormalities.Hippocrates noted that persons with the carinatum deformity experienced "difficulty breathing" and had a "sharply pointed chest."
Patients with symptoms describe breathlessness and a reduction in stamina. Some people have chest wall stiffness, increasing emphysema, reduced lung compliance, and more respiratory tract infections.
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09/22/2022
Compound X2Y is 60% X by mass. Calculate the percent of Y by mass of the compound X2Y2.
The molar mass of compound tells you the mass of 1 mole of that substance. The percent by mass of y in x₂y₂ is 57.14%
What is molar mass ?
Molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×1023 molecules
In compound x₂y, the percentage mass of x is 60%. The percentage mass of y is 40 %. Let the compound weighs M , 2 units of x weigh 0.6M, 1 unit of x weighs 0.3* M and one unit of y weight 0.4*M.
In the compound x2y2, the percentage mass of y is
0.4*2 ÷ (0.4*2 + 0.3* 2 ) = 8 ÷ (.8+.6) = 0.8 ÷ 1.4 = 57.14 %
The percent by mass of y in x₂y₂ is 57.14%.
Thus, the percentage by mass of y in x₂y₂ is 57.14.
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At 80. 0°c and 12. 0 torr, the density of camphor vapor is 0. 0829 g/l. What is the molar mass of camphor? report your answer in grams per mole to the nearest whole number.
The molar mass of camphor in the nearest whole number is 152 g/mol.
Given,
P = 12 torr or 0.01579 atm
1 atm = 760 torr
Density = 0.0829 g/l
R = 0.0821 L.atm/mol.K
T = 273° K + 80° K
T = 353° K
As we know,
PV = nRT
Or, PV = mass × R × T / molar mass
Or, P = mass × R × T / volume × molar mass
Where, mass/ volume = density (d)
P = dRT / molar mass
Now putting the values,
0.01579 = 0.0829 × 0.0821 × 353 / molar mass
Or, molar mass = 152.156 g/mol.
Hence, the molar mass of camphor is 152 g/mol.
The molar mass of a chemical compound is defined because the mass of a pattern of that compound divided by way of the quantity of substance that's the variety of moles in that pattern, measured in moles. The molar mass is a bulk, not molecular, assets of a substance. The molar mass is a mean of many instances of the compound, which regularly vary in mass because of the presence of isotopes. most commonly, the molar mass is computed from the usual atomic weights and is as a result a terrestrial average and a characteristic of the relative abundance of the isotopes of the constituent atoms on the planet. The molar mass is appropriate for converting between the mass of a substance and the amount of a substance for bulk portions.To learn more about molar mass, visit: https://brainly.com/question/16377069
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Phosphoric acid can be prepared by reaction of sulfuric acid with “phosphate rock” according to the equation:
Ca3(PO4)2 + 3H2SO4 => 3CaSO4 + 2H3PO4
How many oxygen atoms are there in 1.75 ng of Ca3(PO4)2?
A)3.4 * 10^12
B)2.72 * 10^13
B) 2.72 * 10^13 oxygen atoms are there in phosphoric acid.
The most significant phosphorus oxygen acid, also known as orthophosphoric acid (H3PO4), is used to create phosphate salts for fertilizers. Additionally, it is utilized in the production of albumin derivatives, dental cement, sugar, and textile manufacturing. It is used in food goods as an acidic, fruity flavoring.
A less concentrated version of phosphoric acid is a colorless syrupy liquid, while pure phosphoric acid is a crystalline solid with a melting point of 42.35° C (or 108.2° F). While white phosphorus is used to create acid with a higher purity, phosphate rock is used to create crude acid. Three classes of salts are produced by phosphoric acid depending on whether one, two, or three hydrogen atoms are substituted.
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1. how common are the elements that living systems are made out of?
2. explain the relationship between matter and energy.
3. why do atoms bond?
Living systems are made out of - phosphorus, sulphur and carbon.
Matter itself has energy and matter can be converted to energy and vice versa.
Atoms associate with one another to strengthen the stability of their arrangement of negatively charged electrons.
Following are the answers to the questions -1. Common elements of the living organisms are - Nitrogen, oxygen, phosphorus, sulphur and carbon. These are the 6 most knowing common elements.
2. It's included more then 95% to 97% mass on a human body . Matter itself has energy and matter can be converted to energy and vice versa. The equal amount of matter can have totally different amount of energy and so show up the different type of matter.
3. Electron can be transferred one atom to another this is the most basic way that outer electron can from atom bond .
Atoms associate with one another to strengthen the stability of their arrangement of negatively charged electrons. The positively charged nucleus is surrounded by these electrons in so-called "shells," and according to quantum theory, each shell becomes stable once it has a particular amount of electrons.
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This diagram
shows a hydrogen atom. Explain why it looks
like it does.
4
Answer:
a diagram of hydrogen has 1 proton with charge (+1) inside it's nucleus and no neutrons
also it has 1 electron with charge (-1) outside the nucleus in orbit
Explanation:
