![electron configuration ns2 np3 electron configuration ns2 np3](https://zookeepersblog.files.wordpress.com/2013/09/2-pastrel-face.jpg)
You want to measure the position of an electron within 5 x 10-11 m. An electron is moving at a speed of 5.0 x 106 m/s.This uncertainty is very significant when applied to atomic and subatomic particles.This indicates the limit of the accuracy of trying to simultaneously determine both an electron’s position and momentum.
![electron configuration ns2 np3 electron configuration ns2 np3](https://image.slideserve.com/1107691/electron-filling-order-figure-8-5-l.jpg)
If the minimum uncertainty (precision) in x is defined as Δx, and that of p is Δp: (Δx)(Δp).Thus, the act of measuring the position results in a change in its momentum λ’ λ.When the electron and photon interact, there is a change in momentum of the electron due to collision with the photon.If you wish to locate the electron within a distance Δx, we must use a photon with a wavelength which is equal to or less than Δx.This limitation is a direct consequence of the wave-nature of electrons.It asserts that “You can NOT measure accuratelyboth the position and momentum of an electron simultaneously, and this uncertainty is a fundamental property of the act of measurement itself”.The uncertainty principle is a cornerstone of quantum theory.This failure is due to violation of the Uncertainty principle.Also, Bohr has no explanation of why electrons simply don’t fall into the positively charged nucleus.Unfortunately, Bohr’s mathematical interpretation fails when an atom has more than 1 electron(nonetheless, it still serves as a useful visual representation of an atom).In chapter 4, we used Bohr’s model of the atom to describe atomic behavior.
![electron configuration ns2 np3 electron configuration ns2 np3](https://image.slideserve.com/812445/ionization-energy-e-i-l.jpg)
Lecture 7: Quantum Numbers and Electron Configurations Dr Harris 9/10/12 HW: Ch5: 2, 5, 7, 17, 19, 24, 43, 44