Which is not a ground state electron configuration?
A. 1s2
B. 1s2 2p1
C. 1s2 2s2
D. 1s2 2s2 2p1
B. because it jumps straight from 1s2 to 2p1
it has to go :: 1s2 2s2 then 2p1
A. 1s2
B. 1s2 2p1
C. 1s2 2s2
D. 1s2 2s2 2p1
it has to go :: 1s2 2s2 then 2p1