View source for Ionization energy

The '''ionization energy''' (symbol: '''''E''<sub>i</sub>''') is the [[energy]] required to remove an [[electron]] from a neutral atom or molecule to form a positively charged [[ion]].<ref>{{GoldBookRef| title = ionization energy | file = I03199 | accessdate = 2010-07-16}}.</ref> '''Ionization potential''' is an older name for the same quantity.

For both historical and technical reasons, ionization energies are often quoted in [[electronvolt]]s; for chemical purposes, it is often more convenient to use molar ionization energies expressed in {{nowrap|kJ mol<sup>−1</sup>}}.

==References==
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