This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
Magnesium has three electron shells. The electron configuration is 2,8,2
Bromine has 4 electron shells.
Sodium, i believe has 3 shells.
A sulfur atom has 3 electron shells.
The correct number of electron clouds or shells sodium has is 3.
Chromium has two electrons in the outer most shell.
Technetium has five electron shells.
Thallium has 6 electron shells.
Curium has seven electron shells.
Yttrium has five electron shells.
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see what period it is in on the periodic table it is in period 6, so therefore there are 6 electron shells or energy levels