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The ionisation energy of hydrogen atom i...

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

Text Solution

Verified by Experts

The correct Answer is:
D
Ionisation energy `EpropZ^(2)`
`:.(E_(He))/(E_(H))=(Z_(He)^(2))/(Z_(H^(2)))`
`=((2)^(2))/((1)^(2))`
`(E_(He))/(13.6)=4`
`:.E_(He)=4xx13.6=54.4eV`
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