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

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KollegeApply · Accepted Answer

Doubly ionized lithium For a hydrogen-like ion with Z protons in the nucleus, the radius of the nth state is given by rn = (n^2a_0)/Z Here , a_0 = 0.53 " pm" For lithium, Z = 3 Therefore, the radius of the first orbit for doubly ionised lithium will be minimum.

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