Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 2 - Atoms, Molecules, and Ions - Questions & Problems: 2.36

Answer

Please see the work below.

Work Step by Step

We know that $K^+$ has 19 protons 18 electrons. $Mg^{+2}$ has 12 protons and 10 electrons. $Fe^{+3}$ has 26 protons and 23 electrons. $Br^-$ has 35 protons and 36 electrons. $Mn^{+2}$ has 25 protons 23 electrons. $C_4^-$ has 6 protons and 10 electrons. $Cu_2^+$ has 29 protons and 27 electrons.
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