Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!
What's the Pauli-exclusion Principle?
Asked by: Wolfgang M.
In 1925, Wolfgang Pauli gave physics his exclusion principle as a way to explain the arrangement of electrons in an atom. His hypothesis was that only one electron can occupy a give quantum state. That is, each electron in an atom has a unique set of quantum numbers (the principle quantum number which gives its energy level, the magnetic quantum number which gives the direction of orbital angular momentum, and the spin quantum number which gives the direction of its spin). If this principle did not hold, all of the electrons in an atom would pile up in the lowest energy state (the K shell). In fact, we now know that that the Pauli exclusion principle holds for not just electrons but for any fermions (half-integer spin particles like electrons, protons, neutrons, muons, and many more.)
Answered by: Joseph Kozminski, B.S., Physics Grad Student, MSU, East Lansing, MI
Erector 10 Model Set
Today's Price: $21.00
Great Erector starter set that allows you to build 10 cool models. Buy it now! Deal ends at midnight!
Here are our physics & astronomy bestsellers:
Solar Science Kit
Mini Plasma Ball
Deluxe 3D Mirascope
Revolving Multi-Color Fiberoptic Light
Deluxe Water Rocket Set
Magnetic Levitator - Classic
Solar System Planetarium 4M Kit
Ultimate Chemistry Set CHEM C3000 v2.0
Worlds Strongest Magnets
Windmill Generator 4M Kit