Question

Any two electrons in an atom can have a maximum of three quantum numbers same.

• A. True
• B. False

Answer 1

The correct option is A True

1. Quantum numbers are used to describe the position and energy of an electron in the atom.
2. There are four quantum numbers: Principal quantum number ($\mathrm{n}$), azimuthal quantum number ($\mathcal{l}$), magnetic quantum number (${\mathrm{m}}_{\mathcal{l}}$), and spin quantum number (${\mathrm{m}}_{\mathrm{s}}$).
3. Pauli-Exclusion principle: It states that in a single atom no two electrons will have the same set of quantum numbers ($\mathrm{n},\mathcal{l},{\mathrm{m}}_{\mathcal{l}},{\mathrm{m}}_{\mathrm{s}}$). It also follows:

• Only two electrons can occupy the same orbital.
• The two electrons that are present in the same orbital must have opposite spins or they should be antiparallel.

4. Thus, an electron can have a maximum of three quantum numbers same following the Pauli-exclusion principle.

Hence, the given statement is TRUE.