Problem: Which of these molecules has the same number of shared and unshared electron pairs?a) CCl2F2b) Br2c) HCld) PF3e) H2S 

FREE Expert Solution

In a Lewis dot structure:

  • Bond → two shared electrons → line ( —) → 1 electron pair
  • Lone pair → unshared electrons at central atom → one lone pair = two dots (•) 


a) CCl2F2

  • Total valence e-


C       1 × 4 e = 4e

Cl      2 × 7 e = 14 e

F       2 × 7 e = 14 e

Total:  32 valence e


  • Lewis structure

  • shared e- → 4 bonds → 4  shared electron pairs 
  • lone pairs = 0not equal
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Problem Details

Which of these molecules has the same number of shared and unshared electron pairs?

a) CCl2F2

b) Br2

c) HCl

d) PF3

e) H2

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