Cesium

Source: http://www.tabulka.cz/english/elements/show.asp?id=55

name Cesium
latin Caesium
french Césium
german Caesium
symbol Cs
proton number 55
atomic weight 132.90545
Pauling electronegativity 0.79
electronic configuration [Xe] 6s1
1s22s22p63s23p63d104s24p64d105s25p66s1
melting point 301.59 K, 28.44°C, 83.19°F
boiling point 944 K, 671°C, 1240°F
group 1
period 6
state (by 20°C) solid
oxidation states +1

Discoverer

Year of discovery Discoverers
1860 Robert W. Bunsen (1811-1899)
Gustav R. Kirchhoff (1824-1887)


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