Most nonmetals form covalent or ionic bonds, depending on the element with which they react. Carbon predominantly forms covalent bonds since it has 4 valence electrons and can form single, double or triple bonds with other elements. What element will form an ionic bond with carbon?
A) calcium
B) hydrogen
C) neon
D) oxygen

Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, and is the primary interaction occurring in ionic compounds.

When an element requires 3 or 4 electrons to complete their octet, they cannot form ionic bond because one require a large amount of energy to completely remove an electron from ones outer shell and transfer it to the other.

Ionic bond is permanent transfer of electrons. Thus, they form covalent bond.

Electronegativity difference between elements involved also plays a major role in bond formation.

If electronegativity between elements is almost similar, then they will form covalent bonds whereas if difference is large, they will form ionic bond.

Calcium and Carbon have greater electronegativity difference and hence it forms ionic bond with Calcium.

Therefore Calcium will form an ionic bond with carbon.

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