Describe the valence bond picture of bonding in ethylene, which is shown below. Identify the number of valence electrons, the number of pi bonds, the number of sigma bonds, and the hybridization of the carbon atomic orbitals. 
Definitions:
Systematic Mistake
An error that occurs consistently due to a flaw in the system, methodology, or process, rather than random or individual mistakes.
Borda Count
A voting system used to rank candidates in which voters rank options, and rankings are then converted into scores to determine the winner.
Arrow's Impossibility Theorem
A theorem stating that no rank-order voting system can simultaneously fulfill all of a certain set of reasonable fairness criteria.
Pairwise Voting
A voting system in which choices are compared one pair at a time, with participants selecting their preference in each matchup.
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