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Question

Chemistry Question on Bohr’s Model for Hydrogen Atom

The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of a singly ionised helium atom would be

A

13.6 eV

B

27.2 eV

C

6.8 eV

D

54.4eV

Answer

54.4eV

Explanation

Solution

: E ∝Z2∝ Z^2 and Z for singly ionised helium is
2 (i.e.,,., 2 protons in the nucleus)
∴(E)He=4×13−6=54.4eV.\therefore \left(E\right)_{He} = 4 \times13-6 = 54.4 eV.