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21 December, 09:52

When a non metal gains or shares by two electrons, its valency will be

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  1. 21 December, 10:11
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    As electrons are negatively charged particles, if it loses 2 electrons, there will be more protons than electrons by 2, therefore the valency will be 2+. If it gains 2 electrons, there will be more electrons than protons by 2, therefore the valency in this case will be 2-.
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