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(B) The atomic number of ${ }_{16} S ^{32}$ is $Z = 16$.The electronic configuration of sulfur is $1s^2, 2s^2, 2p^6, 3s^2, 3p^4$.Grouping these by she

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$2$

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(B) The atomic number of ${ }_{16} S ^{32}$ is $Z = 16$.The electronic configuration of sulfur is $1s^2, 2s^2, 2p^6, 3s^2, 3p^4$.Grouping these by shells (principal quantum number $n$):- $n=1$ ($K$-shell): $1s^2$ (contains $2$ electrons,which is full).- $n=2$ ($L$-shell): $2s^2, 2p^6$ (contains $2+6=8$ electrons,which is full).- $n=3$ ($M$-shell): $3s^2, 3p^4$ (contains $6$ electrons,which is not full as the capacity is $2n^2 = 2(3)^2 = 18$).Therefore,the number of completely filled shells is $2$.

The number of completely filled shells for the element ${ }_{16} S ^{32}$ is

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