Chapter 8, Problem 3PE

What is wrong with the following electron configuration of the ln⁺ ion? What should the electron configuration be?

In⁺

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

(Hint: Check the rules that tell as the order in which electrons are lost by an atom or ion.)