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If the electron configuration of an element is 1S²2S²2P⁵…

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If the electron configuration of an element is 1S²2S²2P⁵, how many unpaired electrons are there?

A. 2

B. 5

C. 1

D. 4

QUICK ANSWER…

C

DETAILS…

According to Hund’s rule, electrons must first of all fill up sub-orbitals singly, before pairing up.

There is just one sub-orbital for S – orbital, and 3 sub-orbitals for P – orbital.

The 1S and 2S orbitals are completely filled, but the 2P orbital which has 5 electrons and 3 sub-orbitals to share them, will firstly be fill with single electrons, and then the two remaining electrons will pair up two sub-orbitals, leaving behind one unpaired electron.

1S[↑↓]  2S[↑↓]  2P[↑↓][↑↓][]

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is correct.
  4. D is not the correct answer.

KEY-POINTS…

You may please note these/this:

  • Hund’s rules states that electrons must singly fill up sub-orbitals before pairing up.
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/ culled from 2015 JAMB-UTME Chemistry PAST question 30 /

If the electron configuration of an element is 1S²2S²2P⁵... » QuizTablet
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