Periodic Trends

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Last updated 11:21 PM on 8/30/26
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11 Terms

1
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Atomic radius: what happens DOWN a group?

Atomic radius increases

2
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Atomic radius: what happens ACROSS a period?

Atomic radius decreases

3
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Why does atomic radius increase down a group?

More electron shells are added → atom becomes larger.

4
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Ionic radius: what happens down a group?

Ionic radius increases

5
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Ionic radius: what happens across a period?

Ionic radius decreases

6
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Metal reactivity: what happens down a group?

Reactivity increases

7
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Metal reactivity: what happens across a period?

Reactivity decreases

8
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Non-metal reactivity: what happens down a group?

Reactivity decreases

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Which non-metal is the most reactive?

Fluorine (F)

10
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Why does metal reactivity increase down a group?

The outer electrons are farther from the nucleus and easier to lose.

11
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Why does non-metal reactivity decrease down a group?

The outer electrons are farther from the nucleus, so attraction for electrons decreases.