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An ionic atom equivalent to hydrogen ato...

An ionic atom equivalent to hydrogen atom has wavelength equal to `1//4` of the wavelengths of hydrogen lines. The ion will be

A

`He^(+)`

B

`Li^(++)`

C

`Ne^(9+)`

D

`Na^(10+)`

Text Solution

Verified by Experts

The correct Answer is:
A
`bar(v) prop (1)/(lambda) prop Z^(2) rArr lambdaZ^(2) =` constant
`rArr lambda = (lambda)/(4) Z^(2) rArr Z = 2`
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