Problem: Which one does not have a completely full quantum level?(A) Na+(B) O2(C) O2-(D) He(E) The quantum levels are completely full in all of the above.

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We’re being asked to determine which of the given species does not have a completely full quantum level.


Completely full quantum level means all of its orbitals completely filled.


Let’s check each of the given species and their location on the periodic table:

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Problem Details

Which one does not have a completely full quantum level?

(A) Na+

(B) O2

(C) O2-

(D) He

(E) The quantum levels are completely full in all of the above.

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