why is the reactivity of metal increase that of non metal decrease as we go down in group
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Metals want to lose electron therefore on moving top to bottom their size increases hence distance of outermost electron increase hence it is for them to donate electron and hence their reactivity increase.
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Amitesh26:
done
In case of non metal they want to gain electron on moving top to bottom size increases therefore it is hard for their nucleus to attract electron therefore their reactivity .
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because metal have character to losing electrons and non metal have gaining electrons
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