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.
There are 3 valence electrons in an atom of aluminium.
Boron has three valence electrons.
nitrogen has 5 valence electrons. carbon has 4 valence electrons.
A barium atom has two valence electrons.
there are 3 valence electrons in the atom of aluminum
There are 3 valence electrons in an atom of aluminium.
Boron has three valence electrons.
nitrogen has 5 valence electrons. carbon has 4 valence electrons.
There are 2 valence electrons in an atom of magnesium. There are 5 valence electrons that are in an atom of phosphorus. There are 4 valence electrons that are in a silicon atom.
The electrons farthest away from the nucleus are the valence electrons of an atom.
A calcium atom has two valence electrons.
the electrons in the outermost shell of an atom are considered to be the valence electrons.
Valence electrons
A barium atom has two valence electrons.
Serine has five valence electrons. It has three valence electrons from the oxygen atom and one valence electron each from the carbon and nitrogen atoms in its structure.
there are 3 valence electrons in the atom of aluminum
An atom with five valence electrons can achieve a full set of eight valence electrons by either gaining three electrons (to reach a stable octet) or losing three electrons to have a stable arrangement. This would result in the atom forming an ionic bond, such as in the case of boron transferring three electrons to become the boride ion.