How many shells are in an atom? If the last shell can hold only 35 atoms, what about the 118th element? How many shells does it have?
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The element with highest known atomic
number is 118 (Ununoctium - Uuo). Its
electronic configuration is
[math][Rn] 5f^{14}6d^{10}7s^{2}7p^{6}[/
math]
meaning, its outermost shell in its ground
state is 7. Therefore, the highest number
of shells an atom can have in its ground
state is 7 as of now. But Uuo is the final
element in the seventh row (period).
Element #119, if/when it is discovered,
will be a member of the 8th period which
will have 8 shells in its ground state.
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