37 - Rubidium alkali metal
Discovered by Robert Bunsen in 1861
Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.
H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 8 | 2 in 4s + 6 in 4p |
| 5 | 1 | 1 in 5s |
85.5 u Atomic Mass
3 Å Atomic Radius
961 K Boiling Point
2.2 Å Covalent Radius
1.53 g/cm³ Density
46.9 Electron Affinity
0.82 Electronegativity
4.18 eV First Ionization Energy
313 K Melting Point
5 Number of Shells
1 Electron Valency
37 Atomic Number
2, 8, 18, 8, 1 Electron Shell Occupations
0.363 J/(g K) Specific Heat