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NEET2003PhysicsAtomic PhysicsActual

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

Options

  1. ADoubly ionized lithium
  2. BSingly ionized helium
  3. CDeuterium atom
  4. DHydrogen atom

Correct answer

A. Doubly ionized lithium

Step-by-step solution

Radius of the first orbit of an atom (R₁= 0.529 Z A^ ) ( R ₁ 1 Z ) where (Z ) is the atomic number of Hydrogen-like atom. Since (Z ) is maximum for doubly ionized lithium, thus radius of first orbit is minimum in doubly ionized lithium.

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