Q.

Which is the best description of a covalent bond?

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a

Electrons are simultaneously attracted by more than one nucleus.

b

Filled orbitals of two or more atoms overlap one another.

c

Unoccupied orbitals of two or more atoms overlap one another.

d

Oppositely-charged ions attract one another.

answer is A.

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Detailed Solution

The best description of a covalent bond is electrons are simultaneously attracted by more than one nucleus.
A covalent bond is formed when an orbital containing a single electron of an atom overlaps with an orbital containing a single electron of another atom. Thus, a covalent bond involves sharing of electrons between two atoms.

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