Periodic Properties Worksheet Key

1. State which atom is larger according to periodic trends.

a) Br, F

b) Ca, Mg

c) C, Si

d) He, Ar

2. Explain the difference in size for each of the pairs in Problem 1.

The outer electrons of the larger atom are in a subshell further away from the

nucleus than the outer electrons of the smaller atom.

3. State which atom is smaller according to periodic trends.

a) P, S

b) Be, Li

c) I, Xe

d) As, Ge

4. Explain the difference in size for each of the pairs in Problem 3.

The outer electrons of both atoms are in the same subshell; however, the smaller

atom has a greater nuclear charge that attracts the electrons closer to the nucleus.

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