Each level of the electron couds hold a certain number of electrons. The first holds 2, the second 8, the third 8.(This is the rule used for an electron cloud.) You can base the number of rings by the number of electrons in the particular element.
Polonium has 6 electron shells.
A sulfur atom has 3 electron shells.
Chromium has two electrons in the outer most shell.
Thallium has 6 electron shells.
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Bromine has 4 electron shells.
Polonium has 6 electron shells.
Magnesium has three electron shells. The electron configuration is 2,8,2
Sodium, i believe has 3 shells.
A sulfur atom has 3 electron shells.
Uranium has 92 electrons, which means it has 7 electron shells.
The correct number of electron clouds or shells sodium has is 3.
A bismuth atom has 6 electron shells.
Phosphorus in is 3rd period. So it has 3 electron shells.
Chromium has two electrons in the outer most shell.
Nickel has 3 (three) electron shells.
Technetium has five electron shells.