Chemistry
WAEC 2009
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
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A.
1s2 2s2 2p2
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B.
1s2 2s2 2p6
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C.
1s2 2s2 2p6 3s2 3p4
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D.
1s2 2s2 2p6 3s2 3p6 4s1
Correct Answer: Option C
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