electrons are blank in an ionic bond, whereas they are blank in a polar covalent bond, and blank in a nonpolar covalent bond

Electrons are transferred in an ionic bond, whereas they are unequally shared in a polar covalent bond, are equally blank in a nonpolar covalent bond.

Explanation:

An ionic bond involved the transfer of electron(s) from one atom to another. For instance, NaCl is formed by a transfer of one electron from sodium to chlorine.

A polar covalent bond is formed by an unequal sharing of electrons between atoms of different electro negativities. This is the case in polar HCl.

Non polar covalent bonds are formed when electrons are equally shared between two or more atoms such as in CH4.

6.4 cm (max) - 25 cm (min)