# Chapter 2 - Chemical Compounds - Questions for Review and Thought - Topical Questions - Page 90a: 11c

Equal number of electrons and neutrons.

#### Work Step by Step

From the symbol, we see that it has a mass number of 72, and there are 36 protons. Thus: Number of neutrons = mass number - number of protons = $72-36=36$ Because it is neutral and there are 36 protons, this means that there are 36 electrons as well.

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