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NCERT Chemistry Class 11 Notes Heisenberg Uncertainty Principle Class 11 Chemistry Notes : According to the Heisenberg’s uncertainty rule, it is not possible to know exactly both the position and the momentum of an electron. Thus, the  certainty  of determination of one property leads to  uncertainty of  determination of the other. The uncertainty in the measurement of position, ∆x, and uncertainty of determination of momentum, ∆p are related by Heisenberg’s relationship as- (∆x) X (∆p) ≥ h/4π Where h is Planck’s constant. If ∆x is very small, i.e., the position of the electron is known more or less exactly, ∆p would be large, i.e. uncertainty of momentum will be large or vice- versa. On the basis of the concept of probability, it is possible to state or predict the probability or relative chance of finding an electron of a particular energy in a given region of space at a given time. The volume in space around the nucleus of the atom, in which there is the maximum pro