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One electron species having ionization e...

One electron species having ionization enegry of `54.4 eV` is

A

`Be^(+2)`

B

`Be^(+3)`

C

He^(+)`

D

`H`

Text Solution

Verified by Experts

The correct Answer is:
C
`He^(+)`
Ionization potential ` = E_(oo) - E_1`
`54.4 = 0 - E_1 or E_1 = - 54.4eV`
But `E_1 = 13.6 xx z^2/((1)^2) eV or - 54.4 eV = -13.6 xxZ^2`
`or Z = 2, ` So `He^(+)` ion.
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