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Ionisation energy of He^+ is 19.6 xx 10^...

Ionisation energy of `He^+` is `19.6 xx 10^-18 J "atom"^(-1)`. The energy of the first stationary state `(n = 1)` of `Li^( 2 +)` is.

A

`4.41xx10^(-16)J atom^(-1)`

B

`-4.41xx10^(-17)J atom^(-1)`

C

`-2.20xx10^(-15)J atom^(-1)`

D

`8.82xx10^(-17)J atom^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(1)/E_(2)=Z_(1)^(2)/Z_(2)^(2)xxn_(2)^(2)/n_(1)^(2)`
`((-19.6xx10^(-18)))/(E_(2))=2^(2)/3^(2)xx1^(2)/1^(2)`
`E_(2)=-4.41xx10^(-17)J atom^(-1)`
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