Chemistry
WAEC 1999
What is the electronic configuration of an element represented as 19
9X?
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A.
1s 22s2 2p 5
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B.
1s22s23s23p3
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C.
1s2 2s2 2p 33s2
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D.
1s 22s22p 63s23p64s 1
Correct Answer: Option A
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