2. The elements known as the alkaline earth metals are found in which Group?
a) 1
b) 2
c) 17
d) 18

3. The properties of silicon are characteristic of
a) a metal, only
b) a nonmetal, only
c) both a metal and a nonmetal
d) neither a metal nor a nonmetal

4. Which substance can be decomposed by a chemical change?
a) ammonia
b) aluminum
c) magnesium
d) manganese

5. What is the maximum number of electrons that can occupy the fourth principal energy level of an atom?
a) 6
b) 8
c) 18
d) 32

6. How does the size of a barium ion compare to the size of a barium atom?
a) The ion is smaller because it has fewer electrons.
b) The ion is smaller because it has more electrons.
c) The ion is larger because it has fewer electrons.
d) The ion is larger because it has more electrons.

7. Which element is brittle in the solid phase and is a poor conductor of heat and electricity?
a) calcium
b) sulfur
c) strontium
d) copper

8. What is the total number of unpaired electrons in an atom of oxygen in the ground state?
a) 6
b) 2
c) 8
d) 4

9. Which of the following sublevels has the highest energy level?
a) 2p
b) 2s
c) 3p
d) 3s

10. In which pair of elements do the nuclei of the atoms contain the same number of neutrons?
a)      c)
b)      d)

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