Pauli exclusion principle?

Question

the principle states that "no two electrons in an atom can have the same four quantum numbers." what does 4 quantum numbers mean? i dont really understand what it is tryign to say

Answer 1

Layer, orbital (azimuthal), magnetic and spin.

No two electons in the same atom can all the 4 numbers the same: be in the same layer, in the same orbital, sharing the same magnetic and spin value.

Answer 2

This was posted by another guy on here, and i thought it was OUTSTANDING. "Organicch..." somebody TAKE THE CREDIT PLEASE.

There are four quantum numbers:
Principal quantum number
Angular quantum number
Magnetic quantum number and
Spin quantum number

The most widely studied set of quantum numbers is that for a single electron in an atom: not only because it is useful in chemistry, being the basic notion behind the periodic table, valence (chemistry) and a host of other properties, but also because it is a solvable and realistic problem, and, as such, finds widespread use in textbooks.


The principal quantum number (n = 1, 2, 3,...) This number has a dependence only the distance between the electron and the nucleus (ie, the radial coordinate, r). The average distance increases with n, and hence quantum states with different principal quantum numbers are said to belong to different shells.

The angular quantum number (l = 0, 1 ... n-1) This quantum number is very important, since it specifies the shape of an atomic orbital and strongly influences chemical bonds and bond angles. In some contexts, l=0 is called an s orbital, l=1, a p orbital, l=2, a d orbital and l=3, an f orbital.

The magnetic quantum number (ml = -l, -l+1 ... 0 ... l-1, l) is the eigenvalue, Jz=mlh/2π.

The spin quantum number (ms = -1/2 or +1/2) was found experimentally from spectroscopy.

Answer 3

Forget about quantum numbers. The exclusion principle states that the probability of finding two fermions with exactly the same properties is zero. Electrons happen to be fermions, but so do quarks, protons, neutrons, the mu, the tau, and the neutrinos.

Answer 4

In quantum mechanics, there are four numbers required to describe the behavior of an electron in an atom. For example, the principal quantum number and the spin number. (There are two more, but they are escaping my memory at this point.)