Identify the isoprene units in limonene,an essential oil found in oil of lemon and orange. 
Definitions:
Electrons
Subatomic particles with a negative charge, found orbiting the nucleus of atoms and involved in chemical reactions and electrical conductivity.
Atomic Number
Number of protons in each type of atom.
Mass Number
Number of protons plus the number of neutrons in each atom.
Neutrons
Subatomic particles found in the nucleus of an atom that have no electric charge.
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