First slide

Hydrogen -like ion

Question

The ratio of ionization energy of hydrogen atom to that of hydrogen like lithium ion is, according to Bohr’s theory

Moderate

A

1 : 1
B

1 : 3
C

1 : 9
D

None of these

Solution

$\frac{Ionization energy of hydrogen atom}{Ionization energy of hydrogen - like atom} = \frac{13 .6 / 1^{2}}{\frac{13 .6 \times 3^{2}}{1^{2}}} = \frac{1}{9}$

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