Question

Ionization energy of the element $X(g)$ is $I$ and the electron affinity of $X^{+}(g)$ is $E$ then

• A. $I=E$
• B. $I=-E$
• C. $I=\frac{E}{2}$
• D. $I=-\frac{E}{2}$

Answer 1

Answer: (B)

$X(g)\to X^{+}(g)+e^{-},\Delta H=I$
$X^{+}(g)+e^{-}\to X(g),\Delta H=-I$
Thus, $I=-E$