Periodic table

 

 

Atomic number:56

Group numbers:2

Period:6

Electronic configuration:[Xe] 6s²

Formal oxidation number:+2

Electronegativities:0.89

Atomic radius / pm:217.4

Relative atomic mass:137.327 ± 0.007

 

Barium was discovered by Sir Humphry Davy (GB) in 1808. The origin of the name comes from the Greek word barys meaning heavy. It is a soft, slightly malleable, silvery-white metal. Barium oxidises in air and reacts with water. Soluble compounds are toxic by ingestion. Barium is found in barytine (BaSO4) and witherite (BaCO3), it is never found in pure form due to its reactivity. Barium must be stored under kerosene to remain pure. Barite, or barium sulfate (BaSO4) is used as a filter for rubber, plastics and resins. It is insoluble in water and so is used in X-rays of the digestive system. Barium nitrate, Ba(NO3)2, burns brilliant green and is used in fireworks.

PHYSICAL PROPERTIES

Density / g dm^-3:3594 (293 K)

 3325 (m.p.)

Molar volume / cm³mol^-1:38.21 (293 K)

 41.30 (m.p.)

Electrical resistivity / μΩcm:50 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:18.4

Melting point / °C:727

Boiling point / °C:1897

Heat of fusion / kJ mol^-1:7.66

Heat of vaporization / kJ mol^-1:150.9

Heat of atomization / kJ mol^-1:180.7

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:502.86

Second ionization energy / kJ mol^-1:965.24

Third ionization energy / kJ mol^-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:250

in the oceans / ppm:0.03

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

Scientific calculator for chemists
Download printable materials	|   |	Free software for Windows
Periodic Table of the Elements

 

Citing this page:

Generalic, Eni. "Barium." EniG. Periodic Table of the Elements. 3 Jan. 2012. KTF-Split. {Date of access}. <http://www.periodni.com/ba.html>.