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Chapter 4 The Structure of the Atom.pdf

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Isotopes and Mass Number<br />

• All atoms <strong>of</strong> a particular element have <strong>the</strong><br />

same number <strong>of</strong> protons and electrons but<br />

<strong>the</strong> number <strong>of</strong> neutrons in <strong>the</strong> nucleus can<br />

differ.<br />

• <strong>Atom</strong>s with <strong>the</strong> same number <strong>of</strong> protons but<br />

different numbers <strong>of</strong> neutrons are called<br />

isotopes.

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