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Democritus was an Ancient Greek pre-Socratic philosopher from Abdera, primarily remembered today for his formulation of an atomic theory of the universe. None of his work has survived. -
he was a ancient Greek philosopher -
he is known for rejecting platos theory -
The alchemists began examining the atomic theory about two centuries after the death of Aristotle -
he was a Irish natural philosopher, chemist, physicist, alchemist and inventor. -
he made atomic models. -
Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is best known for formulating the Periodic Law and creating a version of the periodic table of elements. -
chemicals are arranged by weight. -
Robert Andrews Millikan was an American experimental physicist who won the Nobel Prize for Physics in 1923 for the measurement of the elementary electric charge and for his work on the photoelectric effect. Millikan graduated from Oberlin College in 1891 and obtained his doctorate at Columbia University in 1895 -
how light reacts another electrical discharge -
Henri Becquerel is who discovered radioactivity -
Different atoms and molecules can emit or absorb energy in discrete quantities only. -
electrons in uniform spheres -
he found out atoms are Mosty empty space. -
a model of how electrons orbit the nucleus. -
1914 Moseley published a paper in which he concluded that the atomic number is the number of positive charges in the atomic nucleus. He also stated that there were three unknown elements, -
Ernest Rutherford discovered the proton. -
Erwin Schrödinger formulated a wave equation that accurately calculated the energy levels of electrons in atoms -
we don't know the speed of a partial like a proton or an electron. -
James Chadwick discovered neutrons.