Wiktionary
electron number
n. (context physics English) The number of electrons in an atom or ion
Usage examples of "electron number".
Without really wanting to, he remembered what he had learned about Arkon bombs: set to the electron number of one or more elements, they brought the atoms of those elements into the nuclear reaction and detonation, igniting an atom fire of sorts which could be extinguished only when the 'fuel' had been exhausted.