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The ionisation energy for the Hydrogen a...

The ionisation energy for the Hydrogen atom in the ground state is `2.18 xx 10^(-18)J "atom"^(-1)`. The energy required for the following process `He^(+)(g)rarr He^(2+) (g) +e^(-)` is

A

`8.72 xx 10^(-18) "Jatom"^(-1)`

B

`8.72 xx 10^(-19) "Jatom"^(-1)`

C

`4.35 xx 10^(-18) "Jatom"^(-1)`

D

`2.62 xx 10^(-19) "Jatom"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`[IE]_z = [ IE]_H (z^2)/(n^2)`
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