Difference between revisions 469049550 and 472391631 on enwiki

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Template:Periodic table (discovery periods)
{| border="0" cellpadding="0" cellspacing="1" style="width:80%; background:#f7f7e9; {{{1|}}} border:1px solid #a9a9a9; margin-left: auto; margin-right: auto;"
|- bgcolor=#e9e955
! scope="col" style="width: 1.0%;" | [[Periodic table group|Group]]&nbsp;#
! scope="col" style="width: 5.5%;" | [[Alkali metal|1]]
! scope="col" style="width: 5.5%;" | [[Alkaline earth metal|2]]
(contracted; show full)
| {{element cell|90|thorium     |Th|232.03806(2)|Solid|1800-1849|Primordial}}
| {{element cell|91|protactinium|Pa|231.03588(2)|Solid|1900-1949|Natural radio}}
| {{element cell|92|uranium     |U |238.02891(3)|Solid|Before 1800|Primordial}}
| {{element cell|93|neptunium   |Np|[237.0482]  |Solid|1900-1949|Natural radio}}
| {{element cell|94|plutonium   |Pu|[244.0642]  |Solid|1900-1949|Primordial}}
| {{element cell|95|americium   |Am|[243.0614]  |Solid|1900-1949|
SyntheticNatural radio}}
| {{element cell|96|curium      |Cm|[247.0703]  |Solid|1900-1949|SyntheticNatural radio}}
| {{element cell|97|berkelium   |Bk|[247.0703]  |Solid|1900-1949|SyntheticNatural radio}}
| {{element cell|98|californium |Cf|[251.0796]  |Solid|1950-1999|SyntheticNatural radio}}
| {{element cell|99|einsteinium |Es|[252.0830]  |Solid|1950-1999|Synthetic}}
| {{element cell|100|fermium    |Fm|[257.0951]  |Solid|1950-1999|Synthetic}}
| {{element cell|101|mendelevium|Md|[258.0984]  |Solid|1950-1999|Synthetic}}
| {{element cell|102|nobelium   |No|[259.1011]  |Solid|1950-1999|Synthetic}}
| {{element cell|103|lawrencium |Lr|[262.110]   |Solid|1950-1999|Synthetic}}
| <br />
|}

'''Legend'''
* {{colorbox|#DDDDDD}} Before 1800 (34 elements): discoveries during and before the [[History of the periodic table#Age of Enlightenment|age of enlightenment]].
* {{colorbox|#C1AD84}} 1800–1849 (24 elements):  scientific and [[Industrial Revolution|industrial]] revolutions. 
* {{colorbox|#FBCB83}} 1850–1899 (26 elements):  the age of [[History of the periodic table#Classifying Elements|classifying elements]]; application of [[Spectrum analysis#Origins|spectrum analysis]] techniques: Boisbaudran, Bunsen, Crookes, Kirchhoff, and others "hunting [[emission line]] signatures".
* {{colorbox|#AAD26E}} 1900–1949 (13 elements):  development of [[old quantum theory]] and [[quantum mechanics]].
* {{colorbox|#6CACDE}} 1950–1999 (16 elements):  post Manhattan project; [[Synthetic element|synthesis]] of atomic numbers 98 and above ([[collider]]s, bombardment techniques).
* {{colorbox|#FC86F6}} Since 2000 (5 elements): recent synthesis.
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[[Category:Periodic table]]
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