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Democritus
Democritus was an ancient Greek philosopher, born in Abdera, Greece, he lived from 460 BC to 370 BC. Democritus formed the first atomic theory. He believed that everything was made of atoms and that atoms are indivisible particles that differ in both shape and size. -
J.J Thomson
J.J Thomson was born in Cheetham Hill, December 18 1856.
He studied at Owens College,In 1870 and Trinity College in 1876In 1897 J.J did a series of experiments studyingthe nature of electric discharge and discovered the electron -
Antoine Lavoisier
Antoine Lavoisier was born on August 26, 1743 in Paris, France.Lavoisier went to Mazarin College in 1754 studying chemistry, botany, astronomy, and mathematics he graduated in 1761.Antoine formulated the theory of conversation of mass. Which discovered that although matter changes, mass always stays the same and could not be created or destroyed. This supported Democritus’s theory. He also showed that compounds are just combinations of different types of atoms. -
John Dalton
John Dalton was born in Eaglesfield, England in 1766. He identified the nature of red-green colour blindness.He was the first scientist to explain the behaviour of atoms. -
Dmitri Mendeleev
Dmitri was born in Tobolsk, Siberia 1834.
He studied at St Petersburg and graduated in 1856. Dmitri formulated a periodic table of the elements similar to the one used today. -
Max Planck
Max Planck was born in Kiel, Germany 1858. Planck studied at The University of Munich, 1874-77 and University of Berlin in 1877 and 1888. He initiated the Quantum theory, which explains the construct of energy states in atoms. -
Robert Millikan
Robert Millikan was bore in Morrison, Illinois 1868. He studied at Oberlin College, 1891 and 1893 and was a Scholar of Physics at the University of Göttingen and the University of Berlin.Robert measured electric charges of water, and oil droplets and the basic properties of electrons. For several years he investigated the linear relationship between energy and frequency proposed by Albert Einstein’s and eventually proved the theory. -
Ernest Rutherford
Ernest Rutherford</a>Ernest Rutherford was born in Nelson, New Zealand on August 30, 1871.He received a scholarship in 1889 to the University of New Zealand, and he then went to Canterbury College. And in 1894 he was awarded a Exhibition Science Scholarship to go to Trinity College, Cambridge.He established that the nucleus was very dense, small and positively charged. He also discovered that electrons were located outside of the nucleus. -
Niels Bohr
Niels Bohr was born in Copenhagen, Denmark 1885. Niels discovered that electrons existed at different set energy levels and are at distances from the nucleus -
Erwin Schrodinger
Erwin Schrodinger was born August 12, 1887. He studied at the University of Vienna and earned a doctorate in 1910. In 1927 he succeeded Max Planck, in chair of theoretical physics at the University of Berlin Edwin Schrodinger said that rather than electrons being within an electron configuration of shells and energy levels, they were arranged in orbitals, which were systematically distributed within Electron Clouds. -
James Chadwick
James Chadwick was born in Cheshire, England 1891James Chadwick made an important discovery in nuclear science in 1932 proving the existence of neutrons in atoms -
Aristotle
Aristotle was a Greek philosopher, and scientist born in Macedonia 384 BCAristotles theory was that all matter was composed of four elements; fire, water, earth and air. And that these four elements had certain properties to them.
