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Why do C show 4 valency?...

Why do C show 4 valency?

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The ground state electronic configuration of C is `1s^(2)2s^(2)2p^(2)` In exited state one electron if 2s jumps to 2p, hence the electronic configuratio `1s^(1)2s^(1)2p_(x)^(1)2p_(y)^(1)2p_(2)^(1)`
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