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Carbon atom has electronic configuration...

Carbon atom has electronic configuration ` 1s^(2) 2s^(2)2p_(x)^(1)2p_(y)^(1)` and not `1s^(2)2s^(2)2p_(x)^(2)`. Why ?

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this is according to Hund's rule which states that the degenerate orbitals are first singly filled with parallel electronic spin.
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