## Chemistry: The Central Science (13th Edition)

Published by Prentice Hall

# Chapter 2 - Atoms, Molecules, and Ions - Exercises: 2.25b

Atomic Number

#### Work Step by Step

The atomic number, or the number of protons, defines the identity of the element. This is because the atoms of each element have a characteristic number of protons. Changing neutrons is what makes isotopes.

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