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370
Democritus
Democities was the first to propose the idea of an atom and believed there is a certin point that indestructable. -
400
aristole
He belived that there was no smallest material on earth, but everything was made up of the 4 elements earth,fire water,and air -
Antoine Lavoisier
considered the father of modern chemistry. he reserched many topics, these include combustion,Dismantling Phlogiston, and fixed air. he also held man goverment postions in france -
John Dalton
John Dalton made many contributations to the history of the atom. but it is his atomic theory that is key. 1.Elements are made of extremely small particles called atoms.
2.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3.Atoms cannot be subdivided, created, or destroyed.
4.Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5.In chemical reactions, atoms -
Maire & Pierre Curie
The couple made great strides in the field of radiology. Marie was the first women to win a noble prize. Pierre develpoed Curie Dissymmetry Principle which stated that a a physical effect cannot have a dissymmetry absent from its efficient cause. Marie also discovered new elememnts like poloium -
Henri Bequerel
Henri Discovered spontaneous radioactivity. The experiment included him putting uranium salts in thick black paper and setting it in the sun. This created a negative so he concluded that the uranium must be giving off rays. his expirement lead to the discovery of sponataneous radioactivity and other radioactive elements such as radium and poloium -
J.J. Thompson
famous for the discovery of the electron. he discovered this using cathode rays which he then used a magnet on and when the beam of electrons moved away and to the magnet he knew the beam wasnt light but electrons. he also developed the plum pudding model -
Robert Millikan
Millikan was the man who discovered the exact charge of an electron. He found this by conducting an oil drop expirement that balences downward gravitational forces with an upward drag and electric forces on dropplet of oil between two electrodes. -
Ernest Rutherford
Rutherford conducted the famous gold foil experiment. In which he shot x rays at the foil expecting them to go straight through. nut intead they bounced off. which lead to his conclusion that the atom must have a nucleus. also he concludedthat alot of the atom must be empty space -
Niels Bohr
Neils Bohr was the man who developed the bohr model. he initally tried working with thompson. BUt did most of his big work with Ernest Rutherford. His major contributation was editing the formula of Johann Balmer whose formula worked but no one could explain why until Bohrs contributation -
Henery Mosely
Invented the concept of atomic number. Prior the periodic table was arranged by atomic mass but using x rays he determined what there atomic numbers were. -
Max Planck
He is the man who Introduced the Quantam Theory. saying that the quantam energy was only whole and allowed jumps in temperature instead of hitting them all along the way. like a stair step. -
Werner Heisenburg
He was one of the key inventors of quantam mechanics. By implimenting Matrices into physics. this worked cause he realized he must limit quantam mechanics to observeables -
Erwin Schrodinger
He invented the Schrodinger equation which gave a dervation of the wave equation for time-independent systems and showed that it gave the correct energy eigenvalues for a hydrogen-like atom. he publishes this imformation in "Quantisierung als Eigenwertproblem" this information revolutionized quantam mechanics and he has been praised for his work -
James Chadwick
James Chadwick was a british scientist during the second worl war. His tube alloys led him and his team to work on the manhattan project, the project which developed the nuclear weapons that devastated hiroshima and nagasaki.
