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0 votes
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in Physics by (79.8k points)

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) 54.4 eV

1 Answer

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Best answer

The correct option is (d) 54.4 eV.

Explanation:

∝ Z2 and Z for singly ionised helium is 2 (i.e., 2 protons in the nucleus) 

(E)He = 4 x 13.6 = 54.4 eV.

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