Difference between revisions 469049054 and 469049484 on enwiki

{| 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]] #
! scope="col" style="width: 5.5%;" | [[Alkali metal|1]]
! scope="col" style="width: 5.5%;" | [[Alkaline earth metal|2]]
(contracted; show full)| {{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'''
* 
<span style="background-{{color:box|#DDDDDD;">}} Before 1800</span> (34 elements): discoveries during and before the [[History of the periodic table#Age of Enlightenment|age of enlightenment]].
* <span style="background-{{color:box|#C1AD84;">}} 1800–1849</span> (24 elements):  scientific and [[Industrial Revolution|industrial]] revolutions. 
* <span style="background-{{color:box|#FBCB83;">}} 1850–1899</span> (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".
* <span style="background-{{color:box|#AAD26E;">}} 1900–1949</span> (13 elements):  development of [[old quantum theory]] and [[quantum mechanics]].
* <span style="background-{{color:box|#6CACDE;">}} 1950–1999</span> (16 elements):  "post atomic bomb" era; [[Synthetic element|synthesis]] of atomic numbers 98 and above ([[collider]]s, bombardment techniques).
* <span style="background-{{color:box|#FC86F6;">}} Since 2000</span> (5 elements): recent synthesis.
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[[Category:Periodic table]]
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