Worksheet titled "Periodic Trends Worksheet" that includes multiple-choice questions and short-answer questions about periodic trends in the periodic table, such as electron affinity, electronegativity, ionization energy, and atomic radius.

1. a) N
b) F
c) O
d) Po
e) At
f) Cs

2. Metal

3. The distance from the nucleus to the outermost electron shell of an atom.

4. Across a period (left to right), atomic size decreases due to increasing nuclear charge pulling electrons closer. Down a group, atomic size increases because additional electron shells are added.

5. Cs (Cesium)

6. Metals tend to lose electrons and form positive ions, are good conductors of heat and electricity, and are malleable and ductile. Nonmetals tend to gain electrons, form negative ions, are poor conductors, and are often brittle.

7. a) Similar (both alkali metals)
b) Similar (both alkaline earth metals)
c) Different (metal vs. nonmetal)
d) Similar (both noble gases)
e) Different (nonmetals in different groups)
f) Different (metal vs. nonmetal)

8. F (Fluorine)

9. Group 1 (Alkali metals)

10. Group 18 (Noble gases)