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b) (Write a possible answer in ...) The Pauli Exclusion Principle says that...

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Pauli Exclusion principle is given for identical fermions which states that two or more fermions cannot occupy same quantum state for a given quantum system.

Lets discuss it for electrons in a poly-electron atom. It is not possible for two electrons to have same quantum numbers.

There are four quantum numbers defined which are principal quantum number(n), azimuthal quantum number(l), magnetic quantum number(m-s)and spin quantum number.

Thus all the four can not be equal for two electrons in a atom. Now one may think that for a given

orbital all the quantum numbers are same so how Pauli exclusion principle is valid. But wait for a given orbital in a atom the n,l,m-s are same still the spin quantum number is different. Pauli's exclusion principle is still valid.

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