-
The father of modern chemistry
The first to recognise the true elements -
Gay-Lussac
had found that when gases chemically react, the volumes of both the reactants and the products are in simple ratios. -
John DaltonManchester
he said that Atoms are featureless spheres. The only difference between different elements is their weight. -
Amedeo Avogadro
he published his hypothesis that equal volumes of all gases contain equal numbers of molecules. -
Jöns Jacob BerzeliusStockholm
Determined Atomic Weights Accurately -
Johann DöbereinerJena
“Triads” suggest an underlying pattern -
Karlsruhe
chemists from all over the world congregated in Karlsruhe. -
Dimitri Mendeleev
Mendeleév on his desk played and arranged pieces of paper,
listing elements with their respective atomic weights,
trying to find some order. -
Lothar Meyer’s
Discovered the “modern” Periodic Table -
periodic table of the elements
-
Lecoq de Boisbaudran
Boisbaudran discovers eka-aluminum -
Lars Fredrik Nilson
Nilson discovers eka-boron -
Clemens Winkler
Winkler discovers eka-silicon -
periodic table of the elements
-
the periodic table of elements
A new column is needed for the new element! -
the periodic table of elements
Another gas discovered -
the periodic table of elements
Two more gases discovered -
the periodic table of elements
-
Mendeleev’s last periodic table
-
periodic table of the elements
Brauner attempted to find order in the higher elements -
Ernest Rutherford
Discovered that radium decays through a series of steps, leading apparently to a new group of elements -
the periodic table of elements
-
Henry MoseleyOxford
Moseley predicted the following elements were yet to be discovered:43, 61, 75, 85, 87 -
Soddy
Soddy conceived the idea of an “isotope" -
the periodic table of elements
-
Glenn SeaborgBerkeley periodic table
-
the periodic table of elements
Promethium was discovered in an atomic pile in Oak Ridge, Tennessee -
the periodic table today
