Barium

Statistics:

• Name: Barium
• Symbol: Ba
• Classification: Alkaline Earth Metal
• Atomic Number: 56
• Atomic Mass: 137.327 g/mol
• Density: 3.65 g/cm³
• Melting: 725°C
• Boiling: 1640°C
• Protons & Electrons:56
• Neutrons:81
• Discovered: 1808
• Discovered By: Davy
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 18
• Level 5: 8
• Level 6: 1

Isotopes:

Isotope: Half-life

• ¹³⁰Ba: stable
• ¹³¹Ba: 11.50 days
• ¹³²Ba: stable
• ¹³³Ba: 10.51 years
• ¹³³Ba: 38.9 hours
• ¹³⁴Ba: stable
• ¹³⁵Ba: stable
• ¹³⁶Ba: stable
• ¹³⁷Ba: stable
• ¹³⁷Ba: 2.552 minutes
• ¹³⁸Ba: stable
• ¹³⁹Ba: 83.06 minutes
• ¹⁴⁰Ba: 12.752 days
• ¹⁴¹Ba: 18.27 minutes
• ¹⁴²Ba: 10.6 minutes

Brief Summary

Barium is a Alkaline Earth Metal with the symbol 'Ba' and contains 56 Protons & Electrons with 81 neutrons in the nucleus of the atom. Barium has an atomic mass of 137.327 g/mol and, at a temperature of 20°C, has a density of 3.65 g/cm³. It will melt at a temperature of 725°C and boil at 1640°C.

Barium was discovered by Davy in 1808 and is named 'Barium' Greek word "barys" meaning "heavy".

Some common usages for Barium: Medical applications, among others.

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

Barium :: Ba :: 56 - Chemical Element. 10 Mar. 2010 <http://www.chemicalelement.com/element/barium.html>.