Why is sodium a metal whereas carbon non-metal?
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Metal is a electron donor or it have the tendecy to donate electrons but non metal are the substancses which accepts a electron. Sodium have one electron in it's valence she'll there for it have the tendecy to loose on electron and it's a metal but carbon have $4$ electron in valence shell and it's have a greater affinity to accept electron to complete the order rule.
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