Periodic Table Of The Elements

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Atomic Number: 55
Symbol: Cs
Name: Caesium
Group: 1
Period: 6
Weight: 132.9054519(2)
Density: 1.873
Melting Point: 301.7
Boiling Point: 944
Specific Heat Capacity: 0.242
Electronegativity: 0.79
Abundance: 3