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What is the valence shell electron configuratio... - JAMB Chemistry 2005 Question

What is the valence shell electron configuration of the element with atomic number 17?
A
1s2 2s2 2p6 3s2 3p4
B
1s2 2s2 2p6 3s2 3p5
C
2s2 2p6
D
3s2 3p5
correct option: b
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