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Q1Atomic Structure

Which subshell is filled first according to the Aufbau principle?

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Question 1 / 10
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1. What is the correct electronic configuration for a neutral Chlorine atom (Z=17)?

A1s² 2s² 2p⁶ 3s² 3p⁵
B1s² 2s² 2p⁶ 3s² 3p⁶
C1s² 2s² 2p⁶ 3s² 3p⁴
D1s² 2s² 2p⁶ 3s¹ 3p⁶