Question

State the Aufbau Principle and Hund’s Rule.

Answer 1

Explanation:

AUFBAU PRINCIPLE :

The Aufbau Principle states that in the ground state of an atom, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies. The word 'aufbau' in German means 'building up'. Here, it refers to the filling up of orbitals with electrons..

HUND'S RULE :

Hund's rule states that: Every orbital in a sublevel is singly occupied before any orbital is doubly occupied. All of the electrons in singly occupied orbitals have the same spin (to maximize total spin).

Answer 2

Explanation:

Aufbau Principle rule is the electronic configuration can be built uo by placing electrons in the lowest avaliable orbitals until the total number of electrons added is equal to the atomic number.

Hunds Rule is according to this rule electron pairing in orbitals starts only when all available empty orbitals of the same energy are singly occupiesd.