Question

How does the reactivity change across the period and down the group in a modern periodic table ?

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Answer 1

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Explanation:

metallic characters decreases along the period and decreases down the group

Non-metallic character increases along the period and increases down the group

Answer 2

Metallic character refers to the level of reactivity of a metal.

Non-metallic character relates to the tendency to accept electrons during chemical reactions.

Metallic tendency increases going down a group.

Non-metallic tendency increases going from left to right across the periodic table.