Question

The Ionisation energy of hydrogen atom is 3.6 ev The ionisation energy of helium atom would be

Options

• 13.6 ev

• 27.2 ev

• 6.0 ev

• 54.4 ev

Answer 1

54.4 ev

Explanation:

Iorusation energy = `(13.6Z^2)/n^2` ev   ......(∵ For hydrogen Z = L and n = 1)

Iorusation energy = `(13.6 xx 2^2)/12` = 54.4 ev.