Lonic bonds form when
a. polar molecules are attracted to one another
b. one atom transfers an electron to another atom
c. two atoms share electrons equally
d. two atoms unequally share electrons

b. one atom transfers an electron to another atom

Explanation:

An ionic bond is also called as the electrovalent bond. It is a type of linkage that is formed by the electrostatic attraction formed between ions of opposite charge in a chemical compound.

These bonds are formed when the valence electrons from one of the atom are transferred to the another atom.

when it is at an intermediate population density