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Science · 2022 · 2 marks
CBSE 2022 · Region 2 · Set 1 · Q1
"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence…
"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence electrons in order to attain noble gas configuration." Give reasons to justify this statement.
Marking-scheme solution
If carbon atom gains four electrons to form C \(\displaystyle { }^{4-}\) anion, it would be difficult for its nucleus with six protons to hold on to ten electrons.
If carbon atom loses four electrons to form \(\displaystyle \mathrm{C}^{4+}\) cation, it would require large amount of energy to remove four electrons leaving behind a carbon cation with six protons in its nucleus holding on to just two electrons.
Alternative answer :-
It is difficult for carbon atom to gain $\displaystyle 4$ electrons (C \(\displaystyle { }^{4-}\) anion) or lose $\displaystyle 4$ electrons ( \(\displaystyle \mathrm{C}^{4+}\) cation) as it becomes unstable in terms of energy.All Metals and Non-metals questions2022 question paperNCERT solutions: Metals and Non-metalsPractice Metals and Non-metals →
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.