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

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

Options

(a) Single ionised helium
(b) Deutron atom
(c) Hydrogen atom
(d) Doubly ionised lithium

Correct Answer:

Doubly ionised lithium

Explanation:

r ∝ 1 / Z. For doubly ionised lithium, Z = 3
.·. r will be minimum.

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