Question

valency of carbon is 4.. why

Answer 1

because a carbon atom has four electrons in its outermost valence shell. So, it needs four more electrons to complete its octet. A carbon atom completes its octet only by sharing its valence electrons with other atoms. As a result, a carbon atom forms four covalent bonds by sharing valence electrons with other atoms. It could gain four electrons to form the C4− anion or lose four electrons to form the C4+ cation. Both these conditions would take carbon far away from achieving stability by the octet rule. To overcome this problem carbon undergoes bonding by sharing its valence electrons. 

Answer 2

The valency of carbon is 4.

Explanation:

• The valency of carbon is 4.
• 1s2, 2s2, 2p2 are the outer electronic configurations of carbon.
• In this way, carbon has 4 as its valence electrons.
• Carbon uses these 4 valence electrons to form 4 covalent chains.
• Therefore, 4 is the valency of carbon.
• For instance, in various compounds such as CH4 and CO2, carbon's valency is 4.

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The valency of carbon is 4.

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