This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
The valence shell of sodium has one electron.
six
2
eight.
Ground state electron configuration of zinc (Zn): [Ar]3d104s2.
The valence shell of sodium has one electron.
5
six
six
six
six
two
eight.
2
Ground state electron configuration of zinc (Zn): [Ar]3d104s2.
Zinc is an electron donor; by giving away two electrons, it becomes Zn2+.
dots in an electron shell