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reactive substances and reactive atoms
atoms with fewer than the usual numbers of bonds
atoms with lone pairs
weak bonds
strongly polar or charged atoms
nucleophiles
things attracted to species with a positive charge
weak bonds associated with high reactivity
long C-X bonds
pi bonds
X-Y (with lone pairs) - repulsive interactions between the lone pairs
nucleophiles
react by donating a weakly held pair of electrons - often have a partial or full negative charge
electrophiles
react by accepting a pair of electrons - must have a vacant orbital or a weak breakable bond often have a partial/full positive charge