The first scientific discovery of an element occurred in 1649 when Hennig Brand discovered the element Phosphorous.
Swedish chemist Georg Brandt discovered the element Cobalt
nickel was discovere∂ by Swedish Chemist Axel Fredrick Cronstedt.
Henry Cavendish discovered Hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air
Joseph Priestly discovers Oxygen
English chemist, John Dalton who developed an atomic theory in 1803. Dalton 's atomic theory contains five basic assumptions: All matter consists of tiny particles called atoms.
Johann Dobereiner developed groups of 3 elements with similar properties
Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements
The modern edition of the periodic table was first published outside Russia by Dmitri Mendeleev.
Marie and Pierre Curie worked with uranium ore, extracting the uranium from it and experimenting with it and studying it. As a result, they discovered and were able to isolate radioactive materials.
William Ramsay discovered the Noble Gases.
Lord Rayleigh discovered Argon
J. J. Thompson discovered the electron in 1897
The atomic nucleus was discovered in 1911 by Ernest Rutherford made up of protons and neutrons
Erwin Schrödinger developed an “Electron Cloud Model” in 1926. It consisted of a dense nucleus surrounded by a cloud of electrons at various levels in orbitals.