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WAEC Chemistry 2013 Paper

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Question : 6

Total: 47

Which of the following arrangements represents the correct order of electronic energy level?

1s 2p 2s 3p 3s 3d 4s
1s 2s 2p 3s 3p 3d 4s
1s 2s 2p 3s 3p 4s 3d
1s 2s 3s 2p 3p 4s 3d

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