LC Chemistry Practice Questions - Leaving Certificate Chemistry (Ireland) Exam

What is the correct electron configuration of a neutral chlorine atom (atomic number 17)?

1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p6 3s2 3p6 1s2 2s2 2p6 3s2 3p3 1s2 2s2 2p5 3s2 3p6

1s2 2s2 2p6 3s2 3p5

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