The following represents the formation of bond between atoms A and X. Based on this diagram which element is more electronegative? 
Definitions:
Allyl Anion
A negatively charged species derived from an allyl group, featuring a conjugated system of electrons across three carbon atoms.
Ethylene
A colorless flammable gas with the formula C2H4, used as a hormone in plants and an important industrial organic chemical in the production of polymers.
HOMO
An acronym for Highest Occupied Molecular Orbital, representing the highest energy molecular orbital containing electrons.
LUMO
The Lowest Unoccupied Molecular Orbital, which is the first molecular orbital available for the electron to occupy.
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