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Hennig Brand
although gold, silver, tin, copper, lead and mercury have been known since antiquity. phosphorus was the first discovery dicoververed by a scientist called hennig brand, in 1649. -
john dobereiner
johann dobereiner noticed that the atomic weight of strontium fell midway between the weights of calcium and barium. -
john newlands
!n 1863 an english chemist wrote a paper, which classified the 56 established elements into 11 groups based on similar physical properties. -
william ramsy
in 1894 sir wiliam ramsay and lord rayleigh dicscovered the nobal gases, which were added to the periodic table as group 0. -
J.J thompson
english physicist jj thompson discovered the first electrons, small negatively charged particles in an atom. -
neil bohr
bohr discovered that electrons could move around a nucleus in discrete energy called orbitals.radiation is emitted during movernment from one orbital to another. -
ernest rutherford
ernest rutherford first identified protons in the atomic nucleus in 1914. he also transmutated a nitrogen atom into an oxygen atom for the first time. -
james chadwick
james chadwick was the first person to discover neutrons, and the isotopes was identified. this was the complete basis for the periodic table.
