ទំព័រគំរូ:Periodic table legend/Age of discovery

Background color shows age of discovery:
Antiquity to Middle Ages	Middle Ages–ទំព័រគំរូ:Zwsp1799	1800–ទំព័រគំរូ:Zwsp1849	1850–ទំព័រគំរូ:Zwsp1899	1900–ទំព័រគំរូ:Zwsp1949	1950–ទំព័រគំរូ:Zwsp1999	Since 2000
(13 elements) Antiquity to Middle Ages: unrecorded discoveries up into the Middle Ages	(21 elements) Discoveries during the age of enlightenment	(24 elements) Scientific and industrial revolutions	(26 elements) The age of classifying elements; application of spectrum analysis techniques: Boisbaudran, Bunsen, Crookes, Kirchhoff, and others "hunting emission line signatures"	(13 elements) Development of old quantum theory and quantum mechanics	(16 elements) Post Manhattan project; synthesis of atomic numbers 98 and above (colliders, bombardment techniques)	(5 elements) Recent synthesis