RbZ =  37

From the Latin "rubidus", meaning "deepest red"
(AM) Atomic Mass 85.4678  amu    Oxidation States +1
   (BP) Boiling Point 686  °C    (MP) Melting Point 38.9  °C
   (ρ) Density 1.53  g/cm3    Crystal Structure Body Centered Cubic
   ( χ ) Electronegativity 0.8    (AR) Atomic Radius 2.11  Å
   Physical State Solid (C) Heat Capacity 0.363  J/g °C
Electronic-Config [Kr]  5s1     (I1) First Ionization E 403.02  kJ/mol
   (ΔHvap) Heat of Vaporization 75.77  kJ/mol     (ΔHfus) Heat of Fusion 2.19  kJ/mol
   Year of Discovery 1861    Location of Discovery Germany
(E°) Standard Potential Rb+⇔ Rb (-2.980 V)
Stable isotopes  85Rb
Discovered/Synthesized by Robert Bunsen, Gustav Kirchhoff
Natural Source The mineral/ore lepidolite and pollucite
Common Uses Atomic clocks, global navigation (GPS), vacuum tube scavenger
Other Info Rubidium-87 isotope naturally repel each other
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