What is the mass number of the atom shown?
a. 11
b. 18
d. 20
C. 19

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.

How many grams are in one mole of lead?