7. What happens when an electron jumps from higher to lower energy level?
a. Colored light is given off
b. The atom becomes excited
c. Another electron goes from a lower energy to a high one
d. This process is not possible

8. Why are ionic compounds good conductors of electricity?
a. The strong electrostatic attraction between ions allows electricity to flow freely
b. Aqueous solutions of ionic compounds cause ions to dissociate and are free
to conduct electricity.
c. Strong electrostatic attraction between crystal lattice of ionic compounds is
strong which needs high temperature to melt or boil these compounds.
d. Tonic compounds are electrical.

9. Copper chloride when heated emits blue light. What is the origin of this blue light?
a. The nucleus radiates energy.
b. The electron absorbs energy as it moves around the nucleus.
c. The electron absorbs energy as it jumps to a higher energy level.
d. An excited electron loses energy as it returns to a lower energy level.​