Question

An orbital can never have:

• A. 3 electrons
• B. 0 electrons
• C. 2 electrons
• D. 1 electrons

Answer 1

The correct option is A 3 electrons

An orbital can never have 3 electrons.
An orbital can only accommodate 2 electrons. It can have one electron with spin + 1/2 and other electron with spin -1/2. If we try to add third electron, then two electrons will have same spin. This will violet Pauli's exclusion principle.