Francium has seven electron shells; electrons per shell: 2, 8, 18, 32, 18, 8, 1.
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Rubidium has 5 electron shells. The electron configuration of rubidium is [Kr]5s1.
Magnesium has three electron shells. The electron configuration is 2,8,2
Helium has a total of 1 electron orbital. This electron orbital can hold a maximum of 2 electrons.
A bismuth atom has 6 electron shells.
Phosphorus in is 3rd period. So it has 3 electron shells.