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Periodic trends worksheet - Free Printable

Educational worksheet: Periodic trends worksheet. Download and print for classroom or home learning activities.

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Final Answer:
1. oxygen, carbon, aluminum, potassium
2. neon, aluminum, sulfur, oxygen
3. Fluorine is smaller and holds its electrons tighter than iodine, so it takes more energy to remove one.
4. They have the same number of valence electrons, which mostly decide how an element behaves.
5. a. decrease
b. increase
c. increase
6. Atomic radius gets smaller left to right because protons pull electrons closer without adding new shells.
7. Ionization energy increases left to right because atoms get smaller and hold electrons tighter.
8. a. Al
b. Na
c. S
d. O
e. Br
f. Ca

Parent Tip: Review the logic above to help your child master the concept of periodic trend worksheet.

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