Chapter 7.2, Problem 1PPB

Practice ProblemBUILD

Identify the elements represented by (a) $1s^{2}2s^{2}2p^{6}3s^{2}3p^1,$ (b) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10},$ and $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^5$.