# Question #1bcba

Dec 21, 2017

$X = \setminus \frac{{E}_{i} + {E}_{e a}}{2}$ , where ${E}_{i}$ is the first ionization energy and ${E}_{e a}$ is the electron affinity.
The measurment unit is $\setminus \frac{k J}{\setminus \textrm{m o \le}}$ or $e V$