RUBIDIUM

Atomic Number: 37
Mass Number: 85.4678
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹
Crystal Structure: Body-Centered Cubic
Density: 1.53 g/cm
Melting Point: 39^oC
First Ionization Energy: 403 kJ/mol
Atomic Radius: 248 pm
Ionic Radius: 147 pm
Standard Reduction Potential: -2.93 V (Rb⁺ + e^- = Rb)