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The one electron species having ionisati...

The one electron species having ionisation energy of 54 .4 eV is

A

H

B

`He^(+)`

C

`B^(4+)`

D

`Li^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
B
`I.E. =54.4 eV`
`:. E_(1)` (energy of electron in first orbit)
`= 54.4 eV`
`E_(4) = (-13.6 Z^(2))/(n^(2)) eV "atom"^(-1)`
`:. -54.4 = -13.6 Z^(2)` (Here n=1)
`Z^(2) = 4 rArr Z = 2`
`:.` One electron species in `He^(+) (Z = 2)`
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