Chapter 4, Problem 98E

Interpretation Introduction

Interpretation:

The reason why the electron configuration for copper $\left(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{10}\right)$ is different from its predicted configuration $\left(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^9\right)$ is to be stated.

Concept introduction:

Electronic configuration represents the arrangement of electrons in an atom. The sublevels are filled according to their increasing energies. First, the electrons are filled into the sublevel having the lowest energy. The closest sublevel to the nucleus has the lowest energy. The trend of filling electrons according to the energy of sublevels is given below.

$1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s$