සැකිල්ල:Periodic table legend/Age of discovery

Background color shows age of discovery:
Antiquity to 1600	1600–​1799	1800–​1849	1850–​1899	1900–​1949	1950–​1999	Since 2000
(14 elements) Antiquity to 1600: ancient to early modern discoveries	(27 elements) Discoveries during the Scientific Revolution and the age of enlightenment, part of the gradual rejection of the Aristotelian theory of matter, and Lavoisier's definition of a chemical element	(19 elements) The chemical and industrial revolutions lead to the standardization of chemical techniques and the development of atomic theory for chemistry	(23 elements) The age of classifying elements and Mendeleev's periodic table; application of spectrum analysis techniques: Boisbaudran, Bunsen, Crookes, Kirchhoff, and others "hunting emission line signatures"	(14 elements) Developments in X-ray spectroscopy and radiochemistry allows for many radioactive elements and the final stable elements to be discovered; recognition of the atomic number as defining an element	(16 elements) Post Manhattan project; synthesis of atomic numbers 98 and above (colliders, bombardment techniques, nuclear reactors)	(5 elements) Recent synthesis