A) Aufbaus principle
B) Heisenbergs uncertainty principle
C) Hunds rule
D) Paulis exclusion principle
Correct Answer: D
Solution :
Quantum number of an atom can be defined on the basis of Faults exclusion principle which states that no two electrons can have the same value of all the four quantum numbers. Aufbau rule: The electrons are added progressively to the various orbitals in their order of increasing energies, starting with the orbitals of lowest energy. Hunds rule: .The pairing of electrons in the orbitals of a particular sub-shell does not take place until all the orbitals are singly occupied. Heisenbergs uncertainty principle: It is not possible to determine simultaneously the position and momentum of a small moving particle, such as electron with entire certainty \[\Delta x\times \Delta p\ge \frac{h}{4\pi }\] \[\Delta x\]= uncertainty in position \[\Delta p\] = uncertainty in momentum
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