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define homolytic fission
each of the bonded atoms takes one of the shared pair of electrons from the bond
define heterolytic fission
one of the bonded atoms takes both of the electrons from the bond
define reaction mechanism
how a reaction takes place
define addition
two reactants join together to form one product. eg. double bonds are broken to form single bonds
define substitution
an atom or group of atoms is replaced by a different atom or group of atoms
define elimination
the removal of a small molecule from a larger one so one reactant forms two products.
define nucleophile
an atom or compound with a negative or partial negative charge which is able to form a covalent bond by donating a lone pair of electrons
define electrophile
an atom or group of atoms that is attracted to a region of high electron density and can accept a pair of electrons
define free radical
an atom or group of atoms which have a single unpaired electron
Note 
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