Question

multiple choice question
the rule that each electron occupies the lowest available energy orbital is called
o the aufbau principle
o hunds rule
o the pauli exclusion principle
o heisenbergs uncertainty principle

Explanation:

The Aufbau principle states electrons fill the lowest - energy orbitals first. Hund's rule is about maximum spin multiplicity in degenerate orbitals. The Pauli exclusion principle says no two electrons in an atom can have the same set of quantum numbers. Heisenberg's uncertainty principle is about the inability to simultaneously know certain pairs of physical properties precisely. So, the rule described in the question is the Aufbau principle.

Answer:

the aufbau principle