THE PERIODIC TABLE (7)

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7 Terms

1
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Atoms

Atoms are made of protons (+), neutrons (0), and electrons (–).

2
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Atomic number

The number of protons in an atom.

<p>The number of <strong>protons</strong> in an atom.</p>
3
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Mass number

The total number of protons and neutrons.

<p><strong>The total number of protons and neutrons.</strong></p>
4
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Number of neutrons

=Mass number - atomic number.

5
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Number of electrons

Equal to number of protons in a neutral atom.

6
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Group (Periodic Table)

The vertical column an element is in.

<p>The <strong>vertical</strong> column an element is in.</p>
7
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Period (Periodic Table)

The horizontal row an element is in.

<p>The <strong>horizontal</strong>&nbsp;row an element is in.</p>