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WAEC - Chemistry (1999 - No. 2)
What is the electronic configuration of an element represented as 19
9
X?
1s
2
2s
2
2p
5
1s
2
2s
2
3s
2
3p
3
1s
2
2s
2
2p
3
3s
2
1s
2
2s
2
2p
6
3s
2
3p
6
4s
1
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