# What is the ionization energy with respect to an element?

Feb 6, 2017

$\text{This is the energy associated........}$

#### Explanation:

$\text{This is the energy associated with the formation of 1 mole of}$
$\text{gaseous cations and 1 mole of gaseous electrons from 1 mole}$
$\text{gaseous atoms}$.

To put it more simply this is the energy associated with the given reaction.

$M \left(g\right) + \Delta \rightarrow {M}^{+} \left(g\right) + {e}^{-}$

Thus $\Delta = \text{the ionization energy.......}$

Both the element, and its cation, are specified to be in the gas phase.