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460
Democritus
Democritus’s Atomic Theory is about the atoms in the atmosphere, the atoms that are present in all forms of existence such as: solid or liquid. This shows us that atoms are all individually crated and cannot be parted, no matter what.
Democritus was an ancient philosopher, who lived from 460 BC to 370 BC. -
530
Leucippus
Leucippus born in Greek province of Miletus 500bc.
He is credited for the first theory of the atom.
Leucippus theories/ideas were very advanced and were known by many as his pupil Democrituss would let all know. -
Isaac Newton
Isaac Newton was born in 1642, in Lincolnshire, England in a manor house
Newton was the greatest mathematician of his generation.
Newton formulated a theory of light, the three laws of motion and suggested a mechanical universe with small, solid masses in motion. Contribution to our understanding of the atom -
Antoine Lavoisier
Antoine Lavoisier was born on August 26th, 1743Antoine Lavoisier was called the Father of Modern Chemistry, as he discovered that water is made of hydrogen and oxygen. -
John Dalton
John Dalton was born on September 6th 1766 and died 27th July 1844 at the age of 78.
Dalton’s theory was based on the atoms of different elements that could be distinguished by differences in the atoms weight.
Dalton proposed that elements consisted of atoms that were the same and had the same mass.
He said his theory in a lecture to the Royal Institution in 1803 -
Dmitri Ivanovich Mendeleev
Dmitri Ivanovich Mendeleev was born on Feburary 7th, 1834 and died 2 February 1907. Dmitri created the first periodic table, of the elements in 1869.
Dmitri spent some of his career at St. Petersburg as a lecturer at the university.
Dmitri quit his position at the University of St. Petersburg in 1893. -
Wilhelm Conrad Röntgen
Wihelm Conrad Rontgen born 27 March 1845 at Lennap Germany
Rontgens main discovery was that of rays that he called x-rays in 1895 -
Joseph John (J. J.) Thomson
Joseph John Thomson was born in Cheetham Hill, Manchester, England.
During 1897 Joseph John Thomson discovered the electron in a series of experiments to study the nature of electric discharge by a high vacuum tube, an area that had been investigated by many other scientists around that time.
1904 Thomas created a model of the atom as a sphere of positive matter in which the way electrons are positioned by electrostatic forces. -
Max Karl Ernst Ludwig Planck
Max Karl Ernst Ludwig Planck was born on April 23rd, 1858, in Kiel, GermanyPlank made a lot of contributions to theoretical physics. His theory was revolutionized our understanding of atomic and subatomic processes, just like Albert Einstein’s theory that revolutionized the understanding of time and space. -
Robert Andrews Millikan
Robert Millikan was born on the 22nd of March in 1868, in MorrisonRobert Andrews Millikan determined the charge on electrons. It was John Thomson, however, who determined that electrons exist in the first place. -
Albert Einstein
Albert Einstein was born on March 14th, 1879, in Württemberg,
Germany.
In 1905, Einstein published many scientific works that has changed physics forever. Einstein dealt classical problems of statistical mechanics and problems, these were then merged with the quantum theory. This led to the explanation of the browian movement of molecules. -
Frederick Soddy
Fredrick Soddy was born on September 2nd 1877, in Eastbourne, England
Fredrick said in 1912 that the same elements are contained in different forms, like nuclei having the same number of protons but has a different number of neutrons. -
John Dalton
John Dalton was born on September 6th 1766 and died 27th July 1844 at the age of 78.
Dalton’s theory was based on the atoms of different elements that could be distinguished by differences in the atoms weight.
Dalton proposed that elements consisted of atoms that were the same and had the same mass.
He said his theory in a lecture to the Royal Institution in 1803 -
James Chadwick
James Chadwick was born on 20th October 1891 in Manchester, England and died in Cambridge on 24th of July 1974
James Chadwick discover the neuron by using evidence created by Irene Joliot-Curie
Neutrons had been found to have the same mass as protons, which accounted for more of the mass of the atom and allowed the masses (the known mass of an atom and the known mass of its particles) to match. -
Paul Dirac
Dirac was born 8th August 1902 in Bristol England
Won Noble Prize jointly in 1933 for the discovery of productive forms of atomic theory/development of quantum mechanics
Dirac was a leading scientist in theoretical physicists – developing and discovering quantum mechanics, atomic structure and properties
