A. 1s 2p 2s 3p 3s 3d 4s
B. 1s 2s 2p 3s 3p 3d 4s
C. 1s 2s 2p 3s 3p 4s 3d
D. 1s 2s 3s 2p 3p 4s 3d

Correct Answer: Option C

B. 1s 2s 2p 3s 3p 3d 4s

SEE ALSO  The mass of 800cm³ of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm³]

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