On the periodic table of the elements, mercury (Hg) has an atomic number of 80 and a mass number of 200.59. It has seven stable isotopes. The most abundant of these probably have ________. a. about 80 neutrons each b. fewer than 80 neutrons each c. more than 80 neutrons each d. more electrons than neutrons

The smallest unit of an element that still retains the distinctive behavior of that element is an ________. a. electron b. atom c. elemental particle d. isotope

Which of the following statements about chemical bonds is true?

a. Covalent bonds are stronger than ionic bonds.

b. Hydrogen bonds occur between two atoms of hydrogen.

c. Bonding readily occurs between nonpolar and polar molecules.

d. A molecule of water is unlikely to bond with an ion.

Which of the following is a molecule, but not a compound? a. $H_2O$ b. 2H c. $H_2$ d. $H^+$

When an atom donates an electron to another atom, it becomes a. an ion b. an anion c. nonpolar d. all of the above