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chemistry

Chapter 3- Atoms

TermDefinition
Atamos A greek philosopher named Democritus came up withe the idea that you could divide matter in half a finite number of times
Law of Conservation of Matter Lavoisier, Matter cant be destroyed nor created only transferred
Law of Definite Proportions Proust. A given compound is always made of the same ingredient elects in a set proportion
Law of Multiple Proportions Dalton. Two elements may form more than one compound, but they will be indistinct whole number combinations
Atomic theory of Matter Dalton. Combination of all the laws and made a unified scientific theory called...
Cathode Ray tube used by Thompson and created a model using it
Plum Pudding Model Thompson. Described model as the atom as a mass of positive charge in a matrix with negatively charged electrons scattered.
Gold Foil Experiment Rutherford. Thin foil of gold mounted so he could pass a beam of alpha particles through the foil and detect radiation on photographic film around the whole setup. He expected the beam of positive particles to go straight through the foil and make a spot.
Explained Result Rutherford. Saying that the atom appeared to be mainly empty space. However sometimes the positive beam came close to a dense positive area. which caused the beam to deflect.
Nucleus where most of the mass and positive charge in the atom was concentrated
Proton positive charge that the particle was named
Solar System/ Nuclear Model Rutherford. Where a dense positive center was orbited by moving electrons
Neutrons particles found in the nucleus with no control
Electrostatic opposite charges create an attraction that holds the atom together
Strong Nuclear force The neutrons act as a bugger zone between the protons in the nucleus reducing the repulsion between them
Atomic number number of protons
Atomic Mass the mass of the atom in atomic mass. Protons and neutrons are large, and both assigned 1 amu
Isotopes different versions of the same atom, change in the number of neutrons
Ion something that gains or loses a charge
Wavelength the distance between consecutive crests of a wave
Frequency number of times a crest passes a fixed point in space in a set amount of time
Bohr Asked the question why did the electrons not crash into the nucleus?
Bohr Theory electrons didn't orbit the nucleus. they were residing in very specific and organized energy levels
Created by: madigray