Facts about the Classification of the Element Roentgenium
Rubidium is classified as an "Alkali Metal" and located in Group 1 elements of the Periodic Table. An Element classified as an Alkali Metal is a very reactive metal that does not occur freely in nature. Alkali metals are soft, malleable, ductile, and are good conductors of heat and electricity.

Brief Facts about the Discovery and History of the Element Roentgenium
Rubidium was discovered by Robert Bunsen and Gustav Kirchhoff in 1861 in the mineral lepidolite through the use of a spectroscope. It has the highest room temperature conductivity of any known ionic crystal. Ignites spontaneously in air. Reacts violently in water.

Occurrence of the element Roentgenium
Obtained from lithium production
16th most abundant element in the earth's crust
Occurs naturally in the minerals leucite, pollucite, and zinnwaldite

Common Uses of Roentgenium
Research and development in chemical and electronic applications
Catalyst
Photocells
Fireworks
Vapour turbines
Rubidium chloride

The Properties of the Element Roentgenium
Name of Element : Rubidium
Symbol of Element : Rb
Atomic Number of Rubidium : 37
Atomic Mass: 85.4678 amu
Melting Point: 38.89 °C - 312.04 °K
Boiling Point: 688.0 °C - 961.15 °K
Number of Protons/Electrons in Rubidium : 37
Number of Neutrons in Rubidium : 48
Crystal Structure: Cubic
Density @ 293 K: 1.532 g/cm3
Color of Rubidium : silvery-white