# The symbol of carbon:(A) C (B) Cr (C) Ca (D) Co

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Hint: Usually we use either the first alphabet or first two alphabets from the name of the element to write its chemical symbol. Sometimes two alphabets chosen from the name need not be the first two alphabets. They can be any alphabet from the name.

The atomic number of carbon is 6. Its electronic configuration is $1{s^2}2{s^2}2{p^2}$. Carbon atom has 4 electrons in its outermost shell and needs 4 more electrons to complete its valence shell and attain stable electronic configuration of nearest noble gas neon. For this purpose, a carbon atom shares 4 electrons with 4 other atoms to form four sigma covalent bonds. Thus, carbon is a tetravalent element.