A) Hund's rule In orbitals of equivalent energy electron spins remain unpaired if possible
B) Pauli's exclusion No two electrons can principle have all the four quantum numbers identical
C) Zeeman effect The effect of magnetic field on the atomatic spectra
D) Uncertainty It is impossible to principle determine the position of an electron
Correct Answer: D
Solution :
As per uncertainty principle "It is impossible to determine the position and momentum of a moving electrons in an atoms with accuracy or certainty.
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