Answer & explanation
Correct answer: option 1
$\text{Ionisation Energy } E = E_0 Z^2$
$\Rightarrow \frac{E_1}{E_2} = \frac{1^2}{3^2} = \frac{1}{9}$
Correct answer: option 1
$\text{Ionisation Energy } E = E_0 Z^2$
$\Rightarrow \frac{E_1}{E_2} = \frac{1^2}{3^2} = \frac{1}{9}$