CHEM 212 Lecture Notes - Lecture 2: Werner Heisenberg, Paul Dirac, Rutherford Model

• School: McGill University
• Department: Chemistry
• Course: CHEM 212
• Professor: Laura Pavelka

Document Summary

A sheet of gold foil will deflect a beam of alpha-particles. Rutherford model of the atom:- small, positively charged nucleus (contains much of the atoms mass) is orbited by low-mass electrons. Mass number: number of protons + number of neutrons. Atomic weight measured mass of an atom (not whole number) Atoms with the same number of protons (atomic number), but different number of neutrons (mass number) Hydrogen 1 ( protium, h 99%), hydroggen-2 (0016%) h-3 (0. 004) Average atomic weight: average atomic weight of all the isotopes (hydrogen (= 1. 0078) Electrons are not really orbiting particles, we treat them as waves. Erwin shrodinger: wave equation of an electron and quantum mechanics. Region where probability of finding an electron is very high. The node function of a 1s orbital: = chance of finding an at the curve function of a 2s orbital: where there is 0 probability of finding an electron.