Question

For which of the following species, the expression for the energy of electron in the $n^{th}[E_n=-\frac{13.6Z^2}{n^2}eV{atom}^{-1}]$ has the validity?

• A. Tritium
• B. ${Li}^{2+}$
• C. Deuterium
• D. ${He}^{2+}$

Answer 1

Answer: (A), (B), (C)

The correct options are
A Tritium
B ${Li}^{2+}$
C Deuterium

Here $E_n$ is the energy of $n^{th}$ Bohr orbit. Bohr's theory is applicable to hydrogen or hydrogen-like atoms which contain one electron only. Thus this expression is valid for tritium (${}_1^{3}H$), $L{i}^{2+}$, Deuterium (${}_1^{2}H$) but not to $H{e}^{2+}$ which has zero electron.

option A,B,C are correct