Hund"s dominance : It states that the electrons room singly filled very first in every orbital having actually same spin, then just pairing occurs.

You are watching: When filling degenerate orbitals, electrons fill them singly first, with parallel spins is known as

Heisenberg uncertainty principle : the is identified as the position and also the momentum both deserve to not be identified simultaneously.

Aufbau rule : It states that the atom or ion that current in the ground state, the lowest energy level will be filled very first before occupying the greater levels.

Pauli exemption Principle : It claims that no 2 electrons current in one atom or a molecule can have the same set of the 4 quantum numbers.

Hence, the correct alternative is, (A) Hund"s rule


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Answerhund"s rule;
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