3 shells; 2 electrons in the first shell, 8 in the second shell and 8 in the third shell.
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The innermost electron shell of argon, which is occupied first, contains a total of 2 electrons.
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.