Definition	from 'caesius' or skyblue, it is the softed metal since it is liquid in room temperature of20C.
Discovery	1860 of keirchoff of germany
Uses	photoelectric cells, atomic clocks
Group of Elements	Alkali metals(Liquid)
Atomic Weight	132.90545
Oxidation State	+1
Melting Point	28.40
Boiling Point	669.3
Density	1.87 g/cm3
Electronegativity	0.7