2. Compare the following terms: a. an otom and a molecule
b. an atom and an ion
c. a cation and an anion

a.

Atoms are the building blocks of matter. Molecules are group of two or more atoms bonded together.

b.

Atoms are neutral; they contain the same number of protons as electrons. An ion is an atom or molecule that has a different number of electrons than protons, so it has a charge.

c.

Cations are positively charged ions. Anions are negatively charged ions.

the answer is learned

c. 4.54 x 10–12 j happens to be correct