“The key step in a unimolecular reaction is the formation of the carbon cation, or carbonium ion, by the departure of the leaving group.”

“When the divalent cation dissociates from actin, the affinity of actin for nucleotide is greatly reduced.”

“When two atoms swap electrons to produce a cation and an anion, the two ions are attracted to each other.”

“In other cases the binding of impurity cations on to the resin will enable a purer zeolitic product to be obtained.”

“Non-metals accept electrons in forming anions while metals donate electrons to form cations.”

“The channel is impermeable to anions but is permeable to a diverse group of cations.”