Rubidium

Statistics:

• Name: Rubidium
• Symbol: Rb
• Classification: Alkali Metals
• Atomic Number: 37
• Atomic Mass: 85.4678 g/mol
• Density: 1.53 g/cm³
• Melting: 39°C
• Boiling: 688°C
• Protons & Electrons:37
• Neutrons:48
• Discovered: 1861
• Discovered By: Bunsen and Kirchhoff
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 8
• Level 5: 1

Isotopes:

Isotope: Half-life

• ⁸¹Rb: 4.576 hours
• ⁸²Rb: 1.273 minutes
• ⁸³Rb: 86.2 days
• ⁸⁴Rb: 32.77 days
• ⁸⁵Rb: stable
• ⁸⁶Rb: 18.631 days
• ⁸⁷Rb: 4.75e10 years
• ⁸⁸Rb: 17.78 minutes
• ⁸⁹Rb: 15.15 minutes
• ⁹⁰Rb: 158 seconds
• ^90m1Rb: 258 seconds

Brief Summary

Rubidium is a Alkali Metals with the symbol 'Rb' and contains 37 Protons & Electrons with 48 neutrons in the nucleus of the atom. Rubidium has an atomic mass of 85.4678 g/mol and, at a temperature of 20°C, has a density of 1.53 g/cm³. It will melt at a temperature of 39°C and boil at 688°C.

Rubidium was discovered by Bunsen and Kirchhoff in 1861 and is named 'Rubidium' Latin word "rubidus" meaning "red".

Some common usages for Rubidium: catalyst and photocells.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Rubidium :: Rb :: 37 - Chemical Element. 11 Mar. 2010 <http://www.chemicalelement.com/element/rubidium.html>.