CHEM40S
Mr. Gluchowski
Name:
Periodic Trends
For the following questions, explain the periodic trends in terms of electron configuration. Keep in
mind the three factors that affect these trends.
1. Given the following elements and their electron configuration, which element will have the
lowest ionization energy? Name the elements and explain why.
Element A: 1s2 2s2 2p6 3s2 3p6 4s2
Element B: 1s2 2s2 2p6 3s2 3p5
Element C: 1s2 2s2 2p6 3s2 3p6 4s1
Element D: 1s2 2s2 2p6 3s2 3p6
2. Which of the following has the largest atomic radius and which has the smallest? Explain.
Write the electron configurations for each element.
a. nitrogen
b. phosphorus
c. arsenic
3. For each of the following properties, indicate whether fluorine or bromine would have a larger
value in the following trends:
a. Atomic radius
b. Ionization energy
c. Ionic radius
4. Arrange the following from the largest to smallest ionic radii. Explain the order.
Duke of Marlborough 2019
1
CHEM40S
Mr. Gluchowski
Name:
Ne, Mg2+, F-, Na+, O2-
5. How does the shielding effect influence the force on an electron?
Duke of Marlborough 2019
2