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460 BCE
Democritus
He started the theory of universe that is made up of tiny atoms, which is similar to modern atomic theory -
460 BCE
Democritus
He started the theory of universe that is made up of tiny atoms, which is similar to modern atomic theory -
John Dalton
His theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. All atoms are identical, but different elements had atoms of different size and mass. -
John Dalton
His theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. All atoms are identical, but different elements had atoms of different size and mass. -
Dmitri Mendeleev
The first chemist to use the trends in his periodic table to correctly predict the properties of missing elements, like gallium and germanium. -
Dmitri Mendeleev
The first chemist to use the trends in his periodic table to correctly predict the properties of missing elements, like gallium and germanium. -
Eugene Goldstein
Contributed greatly to the study of cathode rays. He discovered protons with the experiments he did with cathode rays which would knock electrons of atoms and attract them to a positively charged electrode. -
Eugene goldstein
Contributed greatly to the study of cathode rays. He discovered protons with the experiments he did with cathode rays which would knock electrons of atoms and attract them to a positively charged electrode. -
jj thomson
Discovered the electron by experimenting with a cathode ray tube. -
J.J. Thomson
Discovered the electron by experimenting with a cathode ray tube. -
max planck
Originator of the quantum theory of energy. Contributed to the understanding of atomic and subatomic processes -
Max Planck
Originator of the quantum theory of energy. Contributed to the understanding of atomic and subatomic processes -
Robert millikan
Had an oil drop experiment that helped to quantify the charge of an electron, which contributed to the structure of the atom and atomic theory. -
Robert Millikan
Had an oil drop experiment that helped to quantify the charge of an electron, which contributed to the structure of the atom and atomic theory. -
Ernest Rutherford
Had a well known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus. -
ernest rutherford
Had a well known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus. -
Niels Bohr
Proposed a theory for the hydrogen atom, that energy is transferred only in certain well defined quantities -
niels bohr
Proposed a theory for the hydrogen atom, that energy is transferred only in certain well defined quantities -
Erwin Schrodinger
Used mathematical equations to describe the likelihood of finding an electron in a certain position. His model is know as the quantum mechanical model of the atom -
erwin schrodinger
Used mathematical equations to describe the likelihood of finding an electron in a certain position. His model is know as the quantum mechanical model of the atom -
James Chadwick
Mixed beryllium atoms with alpha particles creating a radiation. He thought that the radiation was composed of particles with a neutral electrical charge and the approximate mass of a proton -
james chadwick
Mixed beryllium atoms with alpha particles creating a radiation. He thought that the radiation was composed of particles with a neutral electrical charge and the approximate mass of a proton -
Werner Heisenberg
Best known for his uncertainty principle and theory of quantum mechanics, receiving the nobel prize for physics in 1932 for research and application of the principle. -
werner heisenberg
Best known for his uncertainty principle and theory of quantum mechanics, receiving the nobel prize for physics in 1932 for research and application of the principle.
