Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?

Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?

A 1s² 2s² 2p²
B 1s² 2s² 2p⁶
C 1s² 2s² 2p⁶ 3s² 3p⁴
D 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

waec 2009 chemistry

The correct answer is C. 1s² 2s² 2p⁶ 3s² 3p⁴

No explanation given

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