Chapter 2, Problem 55P

Give the total number of electrons, the number of valence electrons, and the identity of the element with each electronic configuration.

a. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^2$

b. $1s^{2}2s^{2}2p^{6}3s^{2}3p^4$

c. $1s^{2}2s^{2}2p^{6}3s^1$

d. $[Ne]3s^{2}3p^5$