1. What holds molecules together?
(a) Gravitational forces.
(b) Magnetic forces.
(c) Electric forces.
(d) Glue.
(e) Nuclear forces.
2. Which of the following is true for covalently bound diatomic molecules such as H2?
(a) All electrons in atoms have identical quantum numbers.
(b) The molecule has fewer electrons than the two separate atoms do.
(c) The molecule has less energy than two separate atoms.
(d) The energy of the molecule is greatest when the atoms are separated by one bond length.