This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
one valence electrons
Be3+ has only 2 valence electron and not 8.
one electron
Rubidium has one valence electron in the 5s orbital.
Potassium has 1 valance electron.
Se and Te will have the same valence-shell electron configuration as they are both in the same group (group 16) and have 6 valence electrons. Sr and Cs will have different valence-shell electron configurations as Sr is in group 2 with 2 valence electrons and Cs is in group 1 with 1 valence electron. N and O will have different valence-shell electron configurations as N has 5 valence electrons while O has 6. H and He will have different valence-shell electron configurations as H has 1 valence electron and He has 2.
Alkali metals have one valence electron.
One. A hydrogen atom contains only one electron, and it is a valence electron.
one valence electrons
Be3+ has only 2 valence electron and not 8.
one electron
Rubidium has one valence electron in the 5s orbital.
Potassium has 1 valance electron.
The valence of beryllium is two.
There are no valence electrons.
Radium has one valence electron.
Francium has one valence electron.