COMEDK · Chemistry · 2. Structure of Atom
The ionisation energy of hydrogen atom is 13.6 eV . The ionisation energy of \(\mathrm{Li}^{2+}\) ion will be
- A 54.4 eV
- B 40.8 eV
- C 27.2 eV
- D 122.4 eV
Answer & Solution
Correct Answer
(D) 122.4 eV
Step-by-step Solution
Detailed explanation
For hydrogen like particle, energy of \(n^{\text {th }}\)-orbital is given as, \(\begin{aligned} & E_n=-\frac{2 \pi^2 m Z e^4}{n^2 h^2} \text { or }-\frac{K Z^2}{n^2} \\ & Where, K=\frac{2 \pi^2 m e^4}{h^2} \end{aligned}\) Ionisation energy, IE = Energy at infinity - Energy at…
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