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WAEC - Chemistry (2009 - No. 9)
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
1s
2
2s
2
2p
2
1s
2
2s
2
2p
6
1s
2
2s
2
2p
6
3s
2
3p
4
1s
2
2s
2
2p
6
3s
2
3p
6
4s
1
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