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The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of helium atom would be (a) 13.6eV (b) 27.2eV (c) 6.8eV (d) 54.4eV



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


        (a)    13.6eV


(b)    27.2eV


        (c)    6.8eV


        (d)    54.4eV


Grade:11

3 Answers

Amit Saxena
35 Points
10 years ago

(d)

E propoertional Z2 and Z for helium = 2

:. (E)He = 4 × 13.6 = 54.4 eV

Kamaljit
13 Points
6 years ago
First Ionisation potential (energy) of He is ~2372 kJ/mol ~ 24 eV (the highest among all the elements) while the second IP is (calculated from Bohr theory) ~5250 kJ/mol ~ 54 eV.
Abhay
23 Points
6 years ago
AsE=(13.6ev Z^2)÷n^2Atomic weigh of helium is 4E=13.6×4=54.4 Thanks for seen🙌🙋................

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