Part-1. Electronic configuration | ch#5 | 11th class Chemistry

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Electronic configuration

Hunds rule for Electronic configuration
Pauli exclusion principle of Electronic configuration
Aufbau principle of Electronic configuration

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Aufbau Principle
The electrons should be illed in energy
subshells in order of increasing energy values.
The electrons are irst placed in Is, 2s, 2p and
soon.
Pauli’s Exclusion Principle
This principle can be stated as follows:
It is impossible for two electrons residing
in the same orbital of a poly-electron atom to
have the same values of four quantum num bers, or Two electrons in the same orbital
should have opposite spins (↓↑ ).
Hund’s Rules
If, degenerate orbitals are available and more than one electrons are to be placed in them,
they should be placed in separate orbitals with the same spin rather than putting them in the same
orbital with opposite spins
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