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Depends.

Valance is used to describe the other "electron shell" of the atom. The Valance shell is the outer most shell and determines how the atom will react chemically with other atoms. For example, H has one electron and one proton, for a neutral charge, and that electron is also the valance electron, as it is in the out shell.

Shells:

Shells are where the electrons are housed, and are divided into energy levels. To find the Max number of electrons on a shell, use the rule 2n^2 where n is the number of the shell (1st, 2nd etc) So the first shell holds two and the 2nd holds 8 etc.

So if we go back to H we see that it has 1 electron when it;s out shell can house a maximum of 2. Therefore it's valance is 1 (worked out by how many electrons are needed to fill the outer shell or need to be dropped to fill the outer shell, which ever number is lower). This means that H is unstable and will react with many things.

So valance can't tell you how many electrons there are, but that's what the atomic number is for.

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16y ago

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