# Chapter 2 - Atoms, Molecules, and Ions - Questions & Problems - Page 68: 2.18

#### Work Step by Step

We know that a. $W^{186}_{74}$ has 74 protons $186-74=112$ protons and 74 electrons. b. We know that $Hg^{201}_{80}$ has 80 protons $201-80=121$ and 80 electrons.

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