Electron Configuration

[Kr] 5s1

Rubidium means "red"
Melting Point: 39.85 oC
Boiling Point: 687.85 oC
Heat of Vaporization: 885.71 J/g
Heat of Fusion: 25.74 J/g
Specific Heat Capacity: 0.363 J/g . Co or 0.09 cal/g . Co
Density: 1.53 g/cm3