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400
Indivisible, solid sphere model
"All matter is composed of indivisible tiny things made up into small not being able to be seen by the eye structures." -Democritus -
Antoine Lavoisier
Lavoisier contributed his skills in experiments and knowledge. He come up with the idea that matter is unable to become destroyed even if it is rearranged. This was his Law of Conservation. He helped explain what an atom really was. -
Joseph Louis Proust
He first developed the Law of Definate Proportions. This explained that a compound is make up of the exact same proportions by elements by mass. -
John Dalton
Daltons atomic theory consisted of all matter is made up of elements, the elements are identical in mass and property, compounds are formed by a combination of elements, and a chemical reaction is a rearrangement of atoms. -
Michael Faraday
he understood electricity and how if effects solutions, This developed laws of electrolysis. -
Henri Becquerel
Whilehe was studying the x-rays on photographic film, he saw chemicals spontaneously decompose and show pentrating rays. -
J.J. Thomson
Thomson first began a series of experiments which first lead him to discovering the electron. He compared their rays by their plates and magnets. Later on, He estimated the value of charge. This lead him to find that an atom is a sphere of positive matter forced together by electrostatic forces, further leading him to the discovery of the Plum Pudding model. -
Max Planck
He understood the idea of body heat and the electrons is shares through quanta. He measured it in descrite units of measurement. -
Marie Curie
She developed a study to see if any others that shared this strange energy. She contrasted radioactivity to the arrangement of molecules and ended up winning a nobel piece prize. -
Albert Einstein
He published the famous equation that lead to many more discovories. It was E=MC^2. -
Plum Pudding Model
The electrons balance by positive charge. Thomson proposed this model, with positive and negative charge filling a sphere. -
Robert Milikan
Robert Milikan studied electrons charge with an oil-drop apparatus. He combined his outcome of electron charge value to agree with Thomsons estimate. He helped prove the mass of an electron. -
Ernest Rutherford
He looked at the nuclear structure of the atom and proved that alpha particles are fumed into gas atoms, which implies a dense, positively charged main area holding most of the atomic mass. (recieved his nobel piece prize in 1908) -
Planetary Model
Rutherford said the only way the alpha particles could be deflected backwards was if the mass in an atom was concentrated in a nucleus. -
Niels Bohr
He was the first to find electrons travel in different patterns around the nucleus and the number of electrons in the outer area shows the properties of an element. -
Ernest Schrodinger
He understood and developed wave functions which was an "equation to generate a mathematical model for the distribution of electrons in an atom..." (Erwin Schrodinger). His model helps describe where an electron might be. -
Quantum Mechanical Model
Werner Heisenberg makes it more accurate to calculate an electron within a given space. -
Electron Cloud Model
Erwin Schrödinger developed the function for Hydrogen atoms and a few others. It describes a cloud-like area where the electron is likely to be. -
Louis DeBroglie
His ideas lead to the wave mechanics theory. This theory helped us understand the nature on the atomic scale. -
James Chadwick
He discovered a new elementary proton partical. This lead him to a nobel prize. -
Lisa Meitner
She found the Splitting of the Atom and released the possibility of a nucular reactor. -
Glen T. Seaborg
He identified eight elements which greatly advanced chemistry. These helped lead to many more chemical reactions and ideas. -
Otto Hahn
Hahn discovered the fission of uranium. This lead to the atomic bomb.
