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

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Doubly ionized lithium

Singly ionized helium

Deuterium atom

Hydrogen atom

answer is A.

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Detailed Solution

Radius of first orbit, r∝1/Z. For doubly ionized lithium, Z will be maximum. Hence, for doubly ionized lithium r will be minimum.

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