jeff+P

1) History of the atom [] 2) Atomic Structure [] []
 * 400 B.C.- Democritus: first developed idea of the atom. He claimed that the basic matter of particles are called atoms.
 * 1800- John Dalton: english chemist, Dalton preformed many chemical experaments to prove the existance of the atom. Dalton did not know the shape of the atom.
 * 1897- J.J. thomson: discovered the existance of the electron. He made a model of the structure of the atom. Knowing that electrons had a negative charge, he concluded that matter must have a positive charge. The model he created resembled a raisin attatched to a lump of pudding.
 * 1900- Max Panck: prooved that when atom vibrate together fast enough, the energy can be measured through discrete units. He gave them the name quanta.
 * 1909- Ernest Rutherford: Divised a ststem that allowed alpha particles to be shot at a verry thin piece of gold foil and the trajectory of the particles monitored.
 * made from 3 parts- protons, neutrons, and electrons
 * electrons are negative charge
 * protons are positive
 * neutrons are neutral
 * protons and neutrons are located inside the nucleus
 * electrons are located outside the nucleus
 * the number of protons nutrons and electrons makes the atoms of different elements different