2
QuizMultiple Choice

Lab: Rate of Chemical Reactions — Unit test

Question 2 • AZ-Physical Science A-CR

Which element has fewer than four dots in its electron dot diagrams?

Answer
A
arsenic (As)
B
sulfur (S)
C
krypton (Kr)
D
gallium (Ga)

Explanation

Electron dot diagrams show an element’s valence electrons. Gallium is in Group 13, so it has 3 valence electrons and fewer than four dots. Arsenic, sulfur, and krypton have 5, 6, and 8 valence electrons, respectively.

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