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JAMB - Chemistry (1997 - No. 6)
The electron configuration of two elements with similar chemical properties are represented by?
1s
2
2s
2
2p
5
and 1s
2
2s
2
2p
4
1s
2
2s
2
2p
4
and 1s
2
2s
2
2p
6
3s
1
1s
2
2s
2
2p
6
3s
1
and 1s
2
2s
1
1s
2
2s
2
2p
4
and 1s
2
2s
1
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