Atoms - Result Question 31

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

[2003]

(a) Hydrogen atom

(b) Doubly ionized lithium

(c) Singly ionized helium

(d) Deuterium atom

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Answer:

Correct Answer: 33. (b)

Solution:

  1. (b) $r \propto \frac{1}{Z} ; Z(=3)$ is maximum for $Li^{2+}$.