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WAEC - Chemistry (2011 - No. 2)
Which of the following electrons configurations correctly represents an inert element?
1s
2
2s
2
2p
4
1s
2
2s
2
2p
6
3s
2
1s
2
2s
2
2p
6
3s
2
3p
4
1s
2
2s
2
2p
6
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