Template:Periodic table legend/Age of discovery/sandbox1
| Background color shows age of discovery: | ||||||
| Antiquity to Middle Ages | Middle Ages–1799 | 1800–1849 | 1850–1899 | 1900–1949 | 1950–1999 | Since 2000 |
| (12 elements) Antiquity to Middle Ages: unrecorded discoveries up into the Middle Ages |
(22 elements) Discoveries during the age of enlightenment |
(25 elements) Scientific and industrial revolutions |
(24 elements) The age of classifying elements; application of spectrum analysis techniques: Boisbaudran, Bunsen, Crookes, Kirchhoff, and others "hunting emission line signatures" |
(14 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 |