Periodic Trends Worksheet
Name______________________________________
Use the periodic table and your knowledge of periodic trends to answer the following
questions.
Atomic Radius
1. Which atom in each pair has the larger atomic radius? Circle your answer.
a) Li or K
b) Ca or Ni
c) Ga or B
f) Be or Ba
g) Si or S
h) Fe or Au
d) O or C
e) Cl or Br
2. What is the periodic trend for atomic size from top to bottom in a group? From left
to right in a period?
3. Why do atoms get smaller as you move left to right in a period?
4. Why do atoms get larger as you move down a group?
5.
Arrange the following in order of increasing atomic radius atomic radius.
Mg, Na, P, Si and Ar?
Ionic Radius
6. Define an ion.
7. What is the difference between a cation and an anion?
8. Explain the relationship between the relative size of an ion to its neutral atom and
the charge on the ions.
9. Which particle has the larger radius in each atom/ion pair?
a) Na, Na+
b) S, S2c) I, Id) Al, Al3+
10. Which of the following is an isoelectronic series?
A) B5-, Si4-, As3-, Te2B) F-, Cl-, Br-, IC) S, Cl, Ar, K
D) Si2-, P2-, S2-, Cl2E) O2-, F-, Ne, Na+
11. Arrange the following isoelectric series in order from smallest to largest radius.
Cl- ,
K+ ,
Ar
,
Ca2+
Ionization Energy
12. What is ionization energy? What is first ionization energy?
13. What is the periodic trend for first ionization energy?
14. Write the equation for the first ionization of Aluminum.
15. Write an equation for the second ionization of Aluminum.
16. Which element in each pair has the larger ionization energy?
a) Na or O
f) K or V
b) Be or Ba
g) Ca or Fr
c) Ar or F
d) Cu or Ra
e) I or Ne
h) W or Se
17. Arrange the following groups of elements in order of increasing ionization energy.
a) Be, Mg, Sr
b) Bi, Cs, Ba
c) Na, Al, S
Electronegativity
18. Define electronegativity .
19. What is the periodic trend for electronegativity?
20. Which element in each pair has a higher electronegativity value?
a) Cl, F
b) C, N
c) Mg, Ne
d) As, Ca
Metallic Character
21. What is the periodic trend for metallic character?
22. Which of the elements below is most metallic?
Sodium, barium, cesium, magnesium, calcium
Electron Affinity
23. What is electron affinity?
24. What is the periodic trend for electron affinity?
25. Write the chemical equation for the addition of an electron to a chlorine atom.
26. Arrange the following atoms in order of increasing electron affinity:
Br, Sb, I, Te, Cl