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Only electrons move and the nuclei of the atoms never move.
Only electrons that can move are pi electrons, single unpaired electrons, and lone pair electrons.
The total number of electrons in the molecule do not change and neither do the number of paired and unpaired electrons.
Approaches for moving electrons are move pi electrons toward a positive charge or toward an another pi bond. Move a single nonbonding electron towards a pi bond. Move lone pair electrons toward a pi bond and when electrons can be moved in more than one direction, move them to the more electronegative atom