Question

Question #8926c

Answer 1

`.^"16"O`

Explanation:

The definition of quantum spin is `"+/-" (1/2)`. A fractional quantum spin thus can only exist when there are unpaired electrons.

The only element of the selection that has paired electrons in its valence shell is Oxygen-16, with an electron configuration of
`1s^2 2s^2 2p^4`

All of the others have an uneven number of valence electrons, and therefore an unpaired electron.