An isomer in Chemistry would refer to any of two or more than two substances made up of identical elements which are in the same proportions but which differ in properties resulting from the disparity in the arrangement of the atoms.
In the field of Physics it could be used to describe any of two or more than two nuclei which have the same mass number as well as the same atomic number but with different radioactive properties. They can subsist in any of a number of energy states for a considerable period of time.
The word isomer has its roots in the Greek term isomeres, meaning having equal share: a break up of iso-, iso- plus meros, meaning part, share. The adjective form of the word isomer is the word isomeric; while the adverb form of the word is the term isomerically.
In the field of Physics it could be used to describe any of two or more than two nuclei which have the same mass number as well as the same atomic number but with different radioactive properties. They can subsist in any of a number of energy states for a considerable period of time.
The word isomer has its roots in the Greek term isomeres, meaning having equal share: a break up of iso-, iso- plus meros, meaning part, share. The adjective form of the word isomer is the word isomeric; while the adverb form of the word is the term isomerically.