A) Period 2
B) Period 4
C) Period 5
D) Period 3
Answer: D
Explanation: Argon is in horizontal period 3. The period corresponds to the highest occupied principal shell in a neutral atom.
A) Period 2
B) Period 4
C) Period 5
D) Period 3
Answer: D
Explanation: Argon is in horizontal period 3. The period corresponds to the highest occupied principal shell in a neutral atom.
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