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## Homework Statement

State wether atom is in ground or excited state.

## Homework Equations

A.1s

^{2}2s

^{2}2p

^{3 }

B.1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{2}3d

^{10}4p

^{5}5s

^{2}4d

^{7 }

C.1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{2}3d

^{6}

## The Attempt at a Solution

A. Ground because all are filled in order.

B.Excited because the 5s sub-shell isnt quite full.

C.Ground as all are filled in order.

Can someone check that i have this correct and if not please explain to me what ive done wrong. Thanks!!