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Law Conservation of Mass
John Dalton is the scientist credited for the atomic theroy. It states that the total mss present before a chemical reaction is the same as the total mass present after the chemical reaction 1766-1844 -
Antoine Lavoisier
Helped develop the metric system. Discovered mass and that it is the same in different forms. -
John Dalton
Advanced atomic theory, with solid masses in motion. Atoms cannot be created or destroyed. -
Dalton's Atomic Theory
All matter is made of atoms. All atoms of a given elements are identical in mass and properties. Compounds are formed by a combination of two or more different kinds of atoms. A chemical reaction is a rearrangement of atoms. -
Dmitri Mendeleev
Discovered the periodic law. -
Cathode Ray Tube
A vacuum tube in which a beam of electrons are focused to a small cross secion and varied in position and on a display surface. -
J.J Thomson
Discovered the electron. Described atoms as a ball of positive charge with a number of electron. -
Robert Millikan
Conducted the Oil Drop Experiment. -
Plum Pudding Atomic Model
J.J Thomson who discovered the electron. In this model, the atom is composed of electrons. Surrounded by positively charge to balance the negavtively charged. -
Electron Cloud Model
Visual model that maps the locations of electrons. Used to describe the locations of electrons around the nucleus. -
Gold Foil Experiment
Was an experiment to probe the structure of an atom. -
Rutherford Model
The model of an atom by Ernest Rutherford. On the basis of experiments on the scattering of alpha particles. -
Henry Moseley
Justification to the atomic number and Moseley's law. This law advanced Chemistry by sorting elements in the periodic table in a more logical order. -
Bohr Planetary Model
Niels Bohr proposed this model. The mordern model of the atom is based on quantum mechanics. Contains some errors. The negatively-charged electrons orbit a small, postively-charged nucleus. -
Niels Bohr
Father of quantum theory. Came up with the Bohr Planetary Model. -
Ernest Rutherford
Father of nucleus physics. Developed Gold Foil Experiment. Thought the nucleus of an atom was dense and a positive charge. -
Erwin Schrodinger
Proposed, " Electron Cloud Theory" identified the electron cloud as the propable location of moving particles. -
Quantum Mechanical Model
Is the most recent model of the atom. Based on quantum mechanics, quantum numbers are quantum solutions to quantum equations. It's used to find the position and location of an electron. -
Democritus
Found the atom. All atoms are indivisible. 400 B.C. -
James Chadwick
Proved there was a neutron. Discovered a particle in the nucleus that has the same mass as a proton.
