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Jun 1, 1000
Democritus
Democritus is a scientist from Greece who developed the concept of the atom. He develpoed the theory that the universe consistes of empty space and an infinate number of particles that differed in form, position, and arrangment. -
Antoine Lavoisier
He was a French chemist that came up with the theory that mass is neither created nor destroyed in any ordinary chemical reaction. This is known as the law of conservation of mass. -
John Dalton
A scientist from England, John Dalton, developed a model based on extensive observations of pure substances. He was able to develop the idea that tiny particles known as atoms can join together and form molecules in a predictable way and compounds are made of molecules. -
Dalton's Atomic Theory
Dalton came up with the theory that all matter is composed of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties.Atoms acannot be simplified more than they already are and can't be crated or destroyed. -
Dmitri Mendeleev
Dmitri was a Russian chemist an inventor who was the creator of the first version of periodic table of elements. And using the table he was able to predict the properties of the elements yet to be discovered. -
J.J. Thomson
J.J. Thomson is a scientist from britian who discovered tiny negatively charged particles called electrons. He was also able to discover the charge to mass ratio (e/m) of an electron. He was also the one who did the plum pudding atomic model. -
Cathode Ray Tube
This tube is like a vaccum tube containing an electric gun and a fluorecent screen used to view images that was invented by Karl Ferdinand Braun. this invention has greatly contributed to our understanding of the modern world. -
Plum Pudding Model
J.J. Thomson's model shows that each atom was a sphere with positively charged fluid that is called pudding. all throughout this fluid are electrons known as plums. he suggested that the positive fluid held negative charges in the atom because of electrical forces. -
Robert Millikan
Robert was an american perimental physicist who discovered the measurement of the charge on the electron. Not only that but also for the photoelectric effect. -
Ernest Rutherford
Ernest is a scientist from New Zealand who established the nucleus is very dense and small with a positive charge. He also came up with a theory that a neutron could explain why the positive charge of a proton have a repelling effect. -
Gold-Foil Experiment
Ernest Rutherford ran the eperiment after he was done with college and tested how alpha particles interacted with other elements. He did so by probing atoms in a thin gold foil using the alpha particles. -
Ruthford's Model
Ruthford had his own plum pudding model for the atom based on experimental results. The atom itself contained new features of a relatively high central charge that is concentrated into a very smal volume . They use that central volume as the atomic mass of the atom. -
Bohr Planetary Model
Neil Bohr was a student of Ruthford's eho developed a new model of the atom. he stated that the electrons are arranged in circular orbits around the nucleus this model is patterned on the solar system. -
Neil Bohr
He introduced the theory of electrons traveling in orbits around the atoms nucleus. He also introduced the idea that an electron could drop from a higher-energy orbit to a lower one. -
Quantum Mechanical Model
This model is based on mathematics, although it is a little bit more difficult to understand than the Bohr model. This model can be used to explain observations made on complex atoms. -
Henry Moseley
he was an english physicist who outstandingly contributed to the science of physics. Henry came up with chemical concept of the atomic number of an element. -
Erwin Schrodinger
Erwin was an Australian physicist who developed a number of fundamental results in the field of the quantum theory. This theory formed the basis of wave mechanics which he formulated the wave equation. -
Electron Cloud
the Electron Cloud is a visual model of the most probable places of an electron inside an atom. This model was developed by Erwin Schrodinger by using mathematical equations to describe the motion of electrons in an atom. -
James Chadwick
He was an engish noble in physics who discovered the neutron. The discovery of the neutron made it possible to produce the heavier elements than Uranium. -
Antoine Lavoisier
Antoine Lavoisier is a french chemist who formulated the principal of the conservation of mass in chemical reactions. he is also known as the father of modern chemistry that named both oxygen and hydrogen.
