Question

Bohr’s theory is applicable to the following set of species

• A. $H,H{e}^{+},L{i}^{2+},B{e}^{3+}$
• B. $H^{+},L{i}^{2+},H{e}^{+},B{e}^{3+}$
• C. $H^{+},L{i}^{+},H{e}^{+},B{e}^{+}$
• D. For all these sets
  

Answer 1

The correct option is A $H,H{e}^{+},L{i}^{2+},B{e}^{3+}$

Bohr’s theory is applicable to H-atom and H-like species with one electron.
$H$ (Z = 1) 1 electron
$H{e}^{+}$ (Z = 2) 1 electron
$L{i}^{2+}$ (Z = 3) 1 electron
$B{e}^{3+}$ (Z = 4) 1 electron