Radiation Protection Glossary
Search the Glossary by either clicking on a letter or typing a Keyword into the search box.
An ion is a charged
Atom
or molecule. The ion is charged because the number of
Electrons
do not equal the number of
Protons
in the atom or molecule. If the atom or molecule contains an excess of electrons it will be negatively charged (e.g. OH-) where as if it is depleted in electrons it will have a net positive charge (e.g. H+).