Direction:Choose the letter of the correct answer.
11. Which of the following choices below is NOT a property of nonmetals?
a. brittle
b. ductile
c. can be solids, liquids, or gases
d. have low melting and boiling points
12. Which of the following nonmetal is considered as the gas of life?
e. Bromine
f. Chlorine
g. Hydrogen
h. Oxygen
13. What happens to nonmetals when they combine with other elements?
i. gains electrons
j. become gaseous
k. can be pounded now into sheets
1. exhibit brittleness faster as expected
14. Why is helium usually utilized to fly airplanes and in balloons?
m. less dense than air
n. denser than air
0. less dense than water
p. denser than water
15. Which element is used in the cooling processes of refrigerators?
a. Helium B.Krypton
C.Radon
D. Tellurium​