Element Barium

Barium ElementIt is an element with atomic symbol Ba, atomic number 56, and atomic weight 137.
Barium(0) is an elemental barium.
Barium is a silvery-white metal which exists in nature only in ores containing mixtures of elements.
Element Barium combines with other chemicals such as sulfur or carbon and oxygen to form barium compounds.
Barium compounds are used by the oil and gas industries to make drilling muds. Drilling muds make it easier to drill through rock by keeping the drill bit lubricated.
They are also used to make paint, bricks, ceramics, glass, and rubber. Barium sulfate is sometimes used by doctors to perform medical tests and to take x-rays of the gastrointestinal tract.

Names and Identifiers

Chemical Formula:Ba
CAS:7440-39-3
Molecular Weight:137.32700 g/mol
EC Number :231-149-1
MDL Number:MFCD00134031
Color:silvery white
Other Names:Bario
PubChem CID:5355457
IUPAC Name:Barium
Inchl:InChI=1S/Br
InChI Key:DSAJWYNOEDNPEQ-UHFFFAOYSA-N
Canonical SMILES:[Ba]
ICSC Number:1052

Physical & Chemical Properties

Phase:Solid
Density:3.51 g/cm³
Boiling Point:2118 K ​(1845 °C, ​3353 °F)
Melting Point:1000 K ​(727 °C, ​1341 °F)
Molecular Formula:Ba
Flash Point:n/a
Exact Mass:137.90500
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H261-H315-H319-H335
Precautionary Statements:P231 + P232-P305 + P351 + P338-P335 + P334-P370 + P378-P402 + P404
Hazard Codes:C,Xi,F
Risk Phrases:R25
Safety Phrases:S23-S26-S36-S36/37/39-S45-S43-S36/37-S16
RIDADR:UN 3264 8/PG 3
WGK Germany:3
RTECS:CQ8370000
Packaging Group:III
Hazard Class:8

Barium found in the Earth’s crust is a mixture of seven primordial nuclides, barium-130, 132, and 134 through 138.
Barium-130 undergoes very slow radioactive decay to xenon-130 by double beta plus decay, and barium-132 theoretically decays similarly to xenon-132, with half-lives a thousand times greater than the age of the Universe.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
130Ba129.906282 (8)0.106 (1)0
132Ba131.905042 (9)0.101 (1)0
134Ba133.904486 (7)2.417 (18)0
135Ba134.905665 (7)6.592 (12)3/20.837943
136Ba135.904553 (7)7.854 (24)0
137Ba136.905812 (6)11.232 (24)3/20.937365
138Ba137.905232 (6)71.698 (42)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
128Ba127.908312.43 dEC to 128Cs0
129Ba128.908682.2 hEC to 129Cs1/2-0.40
131Ba130.9069311.7 dEC to 131Cs1/20.7081
133Ba132.90600310.53 yEC to 133Cs1/20.7717
139Ba138.9088361.396 hβ to 139La7/2-0.97
140Ba139.9106012.75 dβ to 140La0

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