Question

Define the following:-
(a) Hund's rule
(b) Afbau principal
(c) Pouli principal​

Answer 1

Answer:

a) Every orbital in a sub shell is singly occupied with one electron before any one orbital is doubly occupied and all electrons in singly occupied orbitals have same spin

Answer 2

(a) Hund's rule:-every orbital in a subshell is singly occupied with 1 electron before anyone orbital is doubly occupied, and all electrons in singly occupied orbital have the same spin.
(b) Aufbau principal:- it state that in the ground state of an atom or ion , electron field atomic orbitals of the lowest available energy levels before occupying higher levels.
(c) pouli principal:- the Pauli exclusion principle is the quantum mechanical principle which state the two or more identical fermions cannot occupy the same Quantum state within a Quantum system simultaneously.