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Antoine Laurent Lavoisier
The first to recognize true elements. (1743-1794) -
Gay-Lussac
Found that when gases chemically react , the volumes of both the reactants and the products are in simple ratios. (1788-1850) -
John Dalton
In 1803 he revealed the concept of Dalton's Law of Partial Pressures. He formulated the Atomic Theory. (1766-1844) -
Amedeo Avogrado
In 1811 he published his hypothesis that equal volumes of all gases contain equal number of molecules.(1776-1856) -
Jöns Jacob Berzelius
Determined atomic weights accurately. (1779-1848) -
Johann Wolfgang Dobereiner
Discovered the existence of families of elements with similar chemical properties.(1780-1849) -
Stanislao Canizzaro.
Wrote a pamphlet which clearly distinguished atoms from molecules and allowed unequivocal working definition of atomic weight. -
Lothar Meyer
Discovered the modern periodic table. (1830-1895) -
Dimitri Mendeleev
Discovered the modern periodic table with Lothar Meyer. -
Lecoq de Boisbaudran
Discovered eka-aluminum. -
Lars Nilson
Discovered eka-boron.(1840-1899) -
Clemens Winkler
Discovered eka-silicon.(1838-904) -
Sir Williams Ramsay
Discovered Argon and Helium. (1852-1916) -
Ernest Rutherford
In 1902-1905 Rutherford discovered the radium decays through a series of steps, leading to a new group of elements. (1871-1937) -
Henry Moseley
From Moseley's work scientists now knew that there were 92 elements ranging from hydrogen to uranium.(1887-1915) -
Frederick Soddy
Soddy conceived the idea of an Isotope. (1877-1956) -
Nielhs bohr
Explained the behavior of transition elements and rare earth elements. (1885-1962) -
Glenn Seaborg
Suggested transuranium elements were a new series, akin to the rare earths. (1912-1999) -
Periodic Table Today
The periodic table as it is today, with all the elements in their correct place.
