How many valence electrons are used to make sigma and pi bonds in the #C_3H_6# molecule? How many valence electrons remain in nonbonding pairs in the molecule?

1 Answer
anor277
May 12, 2016

18 valence electrons are present; all of which are involved in bonding.

Explanation:

#C#, #Z=6#, and #H#, #Z=1#, have #4# and #1# valence electron(s) respectively. Thus there are #3xx4+6xx1=18" valence electrons"# to distribute. For #H_3C-(H)C=CH_2#, there are #6xxC-H# bonds, and #3xxC-C# bonds #=# 9 bonds in total (one of these is a #C=C# bond). Thus all the valence electrons are involved in #C-C# or #C-H# bonds.

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