Question

If the ionisaation potential of hydrogen atom isb 13.6 eV.the energy required to remove the electron from the third orbit of hydrogen atom is nearly

• A. 2.5 eV
• B. 1.5 eV
• C. 4.5 eV
• D. 0.85 eV

Answer 1

Answer: (B)

1.5 eV

$E=-13.6\times \frac{z^2}{n^2}$

$=-13.6\times \frac{1}{9}$

$=-1.5eV$

Hence,

option $\left(B\right)$ is correct answer.