10. The isotope deuterium has
a. one proton.

b. one proton and one neutron.
c. one proton and two neutrons.
d. one proton and three neutrons.

11. After filling the first shell, the outermost shell of an atom can hold up to electrons.
a. 2
b. 6
c. 8
d. 10

12. The bond between sodium and chlorine atoms in sodium chloride is a(n)
a. hydrogen bond.
b. ionic bond.
c. polar covalent bond.
d. nonpolar covalent bond.

13. Sucrose is composed of

a. glucose and galactose.
b. glucose and fructose.
c. fructose and maltose.
d. glucose and maltose.