Question

Consider the following steps.
Third ionization energy of $A\left(g\right)$ is

$A\left(g\right)\stackrel{E_1}{\to }{A}^{+}\left(g\right)\stackrel{E_2}{\to }{A}^{2+}\left(g\right)\stackrel{E_3}{\to }{A}^{3+}\left(g\right)$

• A. $E_1+E_2$
• B. $E_1+E_2+E_3$
• C. $(E_1+E_2+E_3)/3$
• D. $E_3$

Answer 1

The correct option is B $E_1+E_2+E_3$

Answer $B.$

$A\left(g\right)\stackrel{E_1}{\to }{A}^{+}\left(g\right)\stackrel{E_2}{\to }{A}^{2+}\left(g\right)\stackrel{E_3}{\to }{A}^{3+}\left(g\right)$

Third ionisation energy is $=E_1+E_2+E_3$

Ionisation energy is the energy needed to remove one or more electrons from a mole of isolated atom is gaseous state. It increases as we start removing electrons.