Question

According to the Pauli exclusion principle, when can two electrons occupy the same orbital?

only if there is no place else to put them

only if they have the same spin

only if they have opposite spins

only if they are alike in all their properties

Answer 1

C.
only if they have opposite spin

Answer 2

When "can two electrons occupy the same orbital" Only if they have opposite spins.

Option (c)

Explanation:

• Pauli  Principle of Exclusion explains that all the four quantum numbers must be different for any of the two electrons of a molecule.

• The number of electrons is determined by the Principle Quantum number, shape of the orbital by the Azimuthal, range of the orbital by the Magnetic and the spin of the electron by the "Spin Quantum Number" respectively.

• We can only place in the same electron if the electrons are of different spin because two electrons will be placed together if they are of either the same electron number or of the same orbital.

• Hence to obey the Exclusion Principle of Pauli, the electrons must be of different spins.

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