Question

Consider the model of the nitrogen atom.

Three concentric circles are shown. Inside the inmost circle are the labels P-7 and N-7. The center circle has red dots at the north and south positions. The outer circle has five red dots evenly spaced around the circle; none of them align with dots in the center ring.

Which electron configuration matches this model?
1s22s22p2
1s22s22p3
1s22s22p4
1s22s22p5

Answer 1

Count the electrons shown: 2 in the innermost shell and 5 in the second shell = 7 electrons total (Z = 7). That corresponds to 1s2 2s2 2p3.