## Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall

# Chapter 3 - Sections 3.1-3.12 - Exercises - Problems by Topic: 23d

#### Answer

1 Calcium (Ca) atom 2 Oxygen (O) atoms 2 Hydrogen (H) atoms

#### Work Step by Step

In the formula $Ca(OH)_{2}$, there is only 1 calcium atom because there is no subscript beside "Ca" indicating that there is only one of that atom. Although oxygen and hydrogen have no subscript beside them they are both in a bracket which has a subscript of 2, indicating that there are 2 oxygen atoms and 2 hydrogen atoms.

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