Concepts

Hund’s Rule

Pairing of electrons in orbitals of same subshell cannot take place until all orbitals have one electron

Pauli’s Exclusion Principle

All the four quantum numbers are not same for electrons in the atom

Aufbau Rule

Orbitals are filled with electrons in the increasing order of energy

Electronic Configuration

Represents the distribution of electrons in various orbitals inside the atom

Spin Quantum Number

Specifies the spin of the electron

Magnetic Quantum Number

Specifies the orientation of the electron in the subshell

Azimuthal Quantum Number

Species the shape of the orbital and it is called as subshell

Principal Quantum Number

Specifies the energy of the electron and size of the shell

Quantum Numbers

Set of four numbers to represent size, shape, orientation and energy of orbits and spin of the electron

Orbitals

Regions around the nucleus where the probability of finding electrons are maximum