This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
Radon has six electron shells.
8
Ununquadium has seven electron shells.
31 electrons, 4 rings/shells.
54 electrons
The number of period corresponds to the total number of electron rings.
Radon is a noble gas; it has 8 electrons in its outer shell.
None. the valence "rings" surround a an atomic nucleus.
Einsteinium has 7 electron shells.
It depends upon the atom.....
Lawrencium has 7 electron shells.
Promethium has 6 electron shells.