The type of compound that is most likely to contain a covalent bond is which of the following?
a. one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table
b. a solid metal
c. a substance held together by the electrostatic forces between oppositely charged ions
d. one that is composed of two nonmetals
e. there is no general rule to predict covalency in bonds