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atomic theory

development of the atomic model

The invisible substance that was believed to be found in substances that could burn. Phlogiston
The scientists who recognized that the "dephlogisticated air" that Priestly discovered was really oxygen, a new element. He collected meticulous quantitative data in his experiments. Antoine Lavoisier
A group of statements that describe the atom. Some of these statements are no longer correct since we know more about the atom. Dalton's Atomic Theory
An experiment that lead to the discovery of the atomic nucleus AND determined that most of the atom is empty space. Rutherford's Gold Foil experiment
He was the first to propose the concept of the atom but he was not taken seriously since he had no experimental evidence. Democritous
His experiments with the cathode ray tube allowed him to discover the negatively charged electron. He proposed a "plum pudding" model. JJ Thomson
His experiments with gold foil allowed him to discover that atoms have a very small, densely packed, positively charged nucleus in their center. Ernest Rutherford
These two men indicated that is is impossible to know both the location and the speed of an electron and that mathematical equations can be used to predict the probability of these properties. Heisenberg & Schrodinger (meow!)
Matter can not be made or destroyed. The mass of the reactants is the same as the mass of the products in a chemical reaction. Law of Conservation of Mass
They believed that everything consisted of four elements: earth,wind, fire, and water. Ancient Greeks
He believed that electrons orbited the nucleus on specific paths or orbits just as planets orbit the sun. He also believed that electrons could gain or lose specific amounts of energy and jump between these energy levels. Niels Bohr
They tried hard to convert common metals into precious metals like gold and silver. Alchemists
The modern day model of the atom in which complex mathematical equations determine the probability of finding and electron in a certain location around the nucleus. Quantum Mechanics
An experiment in which a beam of negatively charged particles, eventually known as electrons, were attracted to a positively charged magnet and repelled by a negatively charged magnet. Cathode Ray Tube Experiment
A school teacher who proposed that all matter is made up of tiny, solid, indivisible atoms that could combine in whole number ratios to form compounds. John Dalton
Created by: jabrophy



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