..::Knowledge of the periodic table::..

Knowledge of the periodic table
researcher, date	Advance
Antonie-Laurent Lavoisier (french),1789	Grouping of 33 elements according to their chemical properties.
Johann Dobereiner (German),1829	Group of three elements (triads)
Jean-Baptiste Dumas (French), 1830	Classification of elements into metals and nonmetals (five families: H, F, O, N and C).
Alexander B. de Chancourtois (French),1862	"Telluric ring" in the form of prop management in order of increasing atomic mass.
Jhon A. Newlands (British), 1865	Group 8 elements (octaves).
J. Lotear Meyer (German) Dimitri I.Mendeleiev (Russian),1869	Long periods (63 items ordered by atomic mass)
William Crookes (British)1888	Cluster model of the elements in three-dimensional spiral
1900	Noble gases are incorporated
Henry G.Moseley (British),1915	Management of chemical elements by atomic number
1939	he periodic system ends in the element uranium
1940	Sare added to the table the elements tranuranidos.
2003	114 elements are known: 90 are in the nature and the rest were created artificially in the laboratory.. However, the atoms of these elements obtained artificially disintegrate in a very small time.