Question

Bohr atom model is invalid for:

• A. Hydrogen atom
• B. doubly ionized helium atom
• C. deuteron atom
• D. singly ionized helium atom
• E. doubly ionized lithium atom

Hint:

The Bohr model is valid only for hydrogen-like atoms, where there is one electron orbiting the nucleus. It does not work for multi-electron systems or atoms that are fully ionized.

Answer 1

The Correct Option is B

Step 1: The Bohr model is applicable to hydrogen-like atoms, where there is a single electron in orbit around the nucleus. For other atoms with multiple electrons, the Bohr model fails to explain their behavior accurately. 
Step 2: In the case of a doubly ionized helium atom, the atom has no electrons, making the Bohr model invalid for such systems. Therefore, the Bohr model does not work for the doubly ionized helium atom.