Chemistry > 2009 > 9
WASSCE
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
A.
1s2 2s2 2p3
B.
1s2 2s2 2p6
C.
1s2 2s2 2p6 3s2 3p4
D.
1s2 2s2 2p6 3s2 3p6 4s1
Answer: C
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