Question

what are hunds rule ,aufbau principle

Answer 1

Hund's rule: every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s shell is filled before the 2s subshell is occupied.


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Answer 2

aufbau principle- it states that orbitals should be filled according to the increasing enery .

Hund's rule- it states that pairing of electrons belonging to same sub shell doesn't take place unless until the orbital belonging to that sub shell has got one electron.