27.9. I http://www.ck12.org
ionic radius
The radius exhibited by an ion in an ionic crystal where the ions are packed together to a point where their
outermost electronic orbitals are in contact with each other.ionization energy
The energy required to remove an electron from a specific atom. It is measured in kJ/mol, which is an energy
unit, much like calories.isoelectric
Having equal numbers of electrons or the same electronic configuration.isotopes
Atoms that have the same atomic number but different mass numbers due to a change in the number of
neutrons.