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In which of the following systems will t...

In which of the following systems will the radius of the first orbit `(n = 1)` be minimum ?

A

Doubly ionized lithium

B

Singly ionized helium

C

Deuterium atom

D

Hydrogen atom

Text Solution

Verified by Experts

The correct Answer is:
A
`r_n=0.529 Å (n^2/Z)`
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