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If an element has three valence electrons, it is most likely a metal.

In the periodic table, metals are found towards the left hand side of the table. Metals have fewer valence electrons than nonmetals. In the periodic table, there are more metallic than nonmetallic elements.

Metals of group 13 typically have three valence electrons. Hence, if an element has three valence electrons, it is most likely a metal of group 13.

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Answer:

When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed along with a sodium nitrate solution.

Explanation:

when silver nitrate solution is added to sodium chloride solution, a white precipitate of silver chloride is formed along with sodium nitrate solution.

AgNO3 + NaCl ----- AgCl + NaNO3

AgCl is white precipitate.

double displacement reaction

Answer:

2 pairs (4 electrons)

Explanation:

In a molecule of oxygen there are 2 oxygen atoms. There are 6 electrons in the outer shells of oxygen atoms. When 2 oxygen atoms form a covalent bond they share their electrons. In a diagram this would be represented by the overlap of the two circles representing the outer shells of both oxygen atoms. If each oxygen atom 'puts forward' 2 electrons into the centre, then 4 will be shared overall for each atom, making both atoms have full outer shells of 8 electrons each. 4 electrons make 2 pairs, hence the answer.

Answer:

2 electrons

Explanation:

Oxygen has 6 valence electrons and to be stable it needs 8. That means it needs 2 more electrons to have a full octet.

Answer:

they are the smallest of space rocks, when in the atmosphere they are called meteors.

Explanation:

i think this is right.

1. Same fossils have been found on different continents

2. Their coastlines fit together

3. Mountain ridges, land formations, glacial evidence, rocks…

Btw, can you describe the rotation of North America? I’m having trouble with continental drift too-

Answer:

20.1974

Explanation:

The Atomic mass will be the same for every isotope as the number of Neutrons changes, not the number of protons.

Neon has two major isotopes. Neon-20 and Neon-22. Out of every 250 neon atoms, 225 will be Neon-2(19.992 g/mol), and 25 will be Neon-22 (21.991 g/mol), then the average atomic mass of Neon20.1974

Atomic mass of an element can be defined as the total number of neutrons and protons present in the nucleus of an atom and the  atomic number is the number of protons present in  nucleus.

the average weight of an element is called as atomic mass while atomic number is total number of protons present in the central nucleus of the atom. Atomic mass is presented a symbolic representation of A where as atomic number is represented by the letter Z.

Atomic mass can not classified  which type of element where as Atomic number classify and identify the type of element, there are different types of isotopes of an element observed on the basis of their atomic mass where as isotopes only share the same atomic number.

Neon has two isotopes such as , N e 20, N e 21 and N e 22.The average atomic mass can be calculated as:

N e  Average atomic mass = [ 19.9924 (90.92 %)] + [ 20.9940 (0.257 %)] + [ 21.9914 (8.82 %)] a m u

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Answer:

it has a fixed volume it can also be compressed

Explanation:

a gases molecules don't move slow because they are not solid and are not compacted.

a gas does not have a fixed shape because there is nothing to hold its shape

Answer: I would say the last one only

Explanation:

Cuz Gases have the following characteristics:

no definite shape (takes the shape of its container)

no definite volume

particles move in random motion with little or no attraction to each other

highly compressible

CFCs are 1000-15000 times powerful as compared to greenhouse gas such as CO2.

Chlorofluorocarbons are present in less amount or less abundant than carbon dioxide gas in the atmosphere but they are 10,000 times more powerful as a greenhouse gas.

These CFCS gases can remain in the atmosphere for more than 45 to 100 years. CFCS gases greatly damaged the ozone layer by reacting with it that leads to increase in the diseases such as skin cancer so we can conclude that CFCs are more powerful as compared to carbondioxide gas.

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Answer:

Argon

Explanation:

It's atomic number is 18

hope that's it

Answer:

N2 + O2 ------------->2NO(Balanced Reaction)

A balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO) -

1/2 [tex]N_{2}[/tex] (g)   + 1/2 [tex]O_2[/tex] (g)   -----------------> NO (g)

Synthesis or formation reactions involve the combination of two or more substances that will react. There is only one product of a synthesis reaction.

1/2 [tex]N_{2}[/tex] (g)   + 1/2 [tex]O_2[/tex] (g)   -----------------> NO (g)

Thus, A balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO) -

1/2 [tex]N_{2}[/tex] (g)   + 1/2 [tex]O_2[/tex] (g)   -----------------> NO (g)

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.5 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.5}{6.02} \\ = 0.581395[/tex]

We have the final answer as

Hope this helps you

Answer:

water will boil at 100 celcius or 212 farenheit

please give brainliest

Answer:

At 100° C or 373.15K

Explanation:

Answer:

because of it being that you have inferno dragon plsss

Answer:

the people injected with the drug are the variable group while the people injected with the harmless solution are the control group

The Earth can be divided into one of two ways – mechanically or chemically. Mechanically – or rheological, meaning the study of liquid states – it can be divided into the lithosphere, asthenosphere, mesospheric mantle, outer core, and the inner core.

Explanation:

A shortcoming of Rutherford’s model of the atom is it did not account for the fact that atoms have equal numbers of protons and electrons. Therefore, option C is correct.

Ernest Rutherford, a scientist who was born in New Zealand, developed the Rutherford model to explain an atom. Rutherford oversaw the Geiger-Marsden experiment, which, after Rutherford's analysis in 1911, indicated that J. J. Thomson's plum pudding model of the atom was flawed, in 1909.

The first person to recognize an atom's nucleus was Rutherford. He attacked gold with -particles and discovered that there was positively charged material inside the atom as a result.

It did not explain the distribution of the atom's negatively charged electrons around its positively charged nucleus.

Thus, option C is correct.

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if density = m(mass) / v(volume) then the answer would be 3

Answer:

Note-taking is simply jotting down the steps to solve specific problems, or listing the resources that can help you when learning something new. In order to take effective notes that can help you understand the material, you can use techniques like Cornell Notes which help you to organize your writing in a way that makes it referable when stuck doing independent work.

Answer: One methane molecule, CH4, contains one carbon atom and four hydrogen atoms.

Explanation:

I am the first one to comment, please give me the brainliest <3

Answer:

igneous rock is the correct answer

molecule (hope this helps :))

Answer:

example:

Explanation:

bicuse its true colum

Answer:

A balanced chemical equation represents a chemical reaction that obeys the Law of Conservation of Mass (Matter). It can be thought of as describing how many atoms or molecules of reactants are consumed in order to produce a certain number of atoms or molecules of products.

Answer:

So, you can say that in a hydrogen atom, an electron located on

n i=2

that absorbs a photon of energy

4.85⋅10−19

J can make the jump to n f=6.