First slide

Bohr's atom model

Question

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

Moderate

A

Doubly ionized lithium
B

Singly ionized helium
C

Deuterium atom
D

Hydrogen atom

Solution

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

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