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Electrons enter into orbitals in order of increasing energy as exemplified by?

Chemistry
JAMB 2022

Electrons enter into orbitals in order of increasing energy as exemplified by?

  • A. 1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^0\)
  • B. 1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^1\)2pz\(^1\)3s\(^0\)
  • C. 1S\(^2\)2S\(^2\)2PX\(^1\)2py\(^1\)2pz\(^1\)3s\(^1\)
  • D. 1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^1\)
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Correct Answer: Option B
Explanation

Shells and subshells are filled in energy level order, so electrons will fill the 2p subshell before the 3s shell.

And the x subshell before the y and z.

There is an explanation video available below.

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Explanation Video

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