37 Rb 85.46783

Rubidium

ALKALI METAL

Phase: Solid

Discovered: Robert Bunsen

Block: S

Summary

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.

Appearance: grey white

Source: Wikipedia

Physical Properties

Atomic Mass 85.46783 u

Density 1.532 g/cm³

Melting Point 312.45 K

Boiling Point 961 K

Molar Heat 31.06 J/(mol·K)

Electron Affinity 46.884 kJ/mol

Ionization Energies

1^st: 403 kJ/mol

2^nd: 2633 kJ/mol

3^rd: 3860 kJ/mol

4^th: 5080 kJ/mol

5^th: 6850 kJ/mol

6^th: 8140 kJ/mol

7^th: 9570 kJ/mol

8^th: 13120 kJ/mol

9^th: 14500 kJ/mol

10^th: 26740 kJ/mol