Which of the following statements about covalent bonds are true? Select all that apply.
A. Covalent bonds are composed of metal atoms that share at least some of their valence electrons.
B. Covalent bonds hold the atoms together in discrete molecules.
C. Covalent bonds form when atoms of nonmetals are close enough to each other for their orbitals to overlap.
D. Covalent bonds can be single, double, or triple bonds.
E. Covalent bonds hold ionic compounds together.