Chemical Elements.com

Show Table With:
   Name
   Atomic Number
   Atomic Mass
   Electron Configuration
   Number of Neutrons
   Melting Point
   Boiling Point
   Date of Discovery
   Crystal Structure

Element Groups:
   Alkali Metals
   Alkaline Earth Metals
   Transition Metals
   Other Metals
   Metalloids
   Non-Metals
   Halogens
   Noble Gases
   Rare Earth Elements

Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Barium
Symbol: Ba
Atomic Number: 56
Atomic Mass: 137.327 amu
Melting Point: 725.0 °C (998.15 K, 1337.0 °F)
Boiling Point: 1140.0 °C (1413.15 K, 2084.0 °F)
Number of Protons/Electrons: 56
Number of Neutrons: 81
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 3.51 g/cm³
Color: Silver

Atomic Structure

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
Ba-130	Stable
Ba-131	11.7 days
Ba-132	Stable
Ba-133	10.5 years
Ba-133m	1.6 days
Ba-134	Stable
Ba-135	Stable
Ba-135m	1.2 days
Ba-136	Stable
Ba-137	Stable
Ba-137m	2.6 minutes
Ba-138	Stable
Ba-139	1.4 hours
Ba-140	12.8 days
Ba-141	18.3 minutes
Ba-142	10.7 minutes

Facts

Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Name Origin: From the Greek word barys (heavy)
Uses: Medical applications, among others
Obtained From: barytine, whiterite

MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Barium. <http://www.chemicalelements.com/elements/ba.html>.

For more information about citing online sources, please visit the MLA's Website.