A carbon atom four electrons to complete its octet.

gains

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loses

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Solution

The correct option is C shares
$∙$ The atomic number of carbon is six and it has an electronic configuration: ${1s}^{2}$ ${2s}^{2}$ ${2p}^{2}$ .
$∙$ Carbon cannot form a $C^{4 +}$ ion as it requires a large amount of energy to lose 4 electrons.
$∙$ Carbon cannot form a $C^{4 -}$ ion as well because it would be difficult for the nucleus with six protons to hold ten electrons.

Therefore, a carbon atom usually share electrons with other carbon atoms or atoms of other elements to complete its octet.

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Question 21
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