Question

hi frnds........Q-write a note abt PAULI EXCLUSION PRINCIPLE​

Answer 1

Answer:

Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. In other words, (1) no more than two electrons can occupy the same orbital and (2) two electrons in the same orbital must have opposit

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Answer 2

Answer:

Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. In other words, (1) no more than two electrons can occupy the same orbital and (2) two electrons in the same orbital must have opposite spins .

In general, opposing spins (proton +1/2 and neutron −1/2) of the proton and the neutron cancel the magnetic field. In certain cases, such as hydrogen atom or certain isotopes, nuclear magnetic moment may be significant. Although electron spin generates magnetic momentum, the opposite spins of the two electrons in the same orbital cancel out their magnetic momentum with no residual magnetic momentum. Atoms with unpaired electrons spinning in the same direction contain net magnetic moments and are weakly attracted to magnets. The overall magnetic activity depends upon the alignment of their unpaired electrons. If they exhibit random movement (Figure 46(iii–v)), there will be no net magnetic moment. However, if the unpaired electrons are parallel to the same direction, the particles exhibit magnetic moment.

Now, electrons are usually paired in their molecular orbitals and, according to the Pauli exclusion principle, their spins must be anti-parallel, that is, in opposite directions. This is known as a singlet state (S). When radiation is absorbed to promote an electron, the spin of the excited electron is conserved – the same as it was in the ground state (because the simultaneous change of both electronic energy and spin is forbidden according to the quantum number rules). The result is called an excited singlet state (S2 in Fig. 5.2). This conserved spin permits the ready return of the electron to its previous state (S1) through a fluorescent emission since it can, of course, re-enter the original orbital without breaking the Pauli exclusion principle.

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