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Barium

Barium General

Name:Barium Symbol:Ba
Type:Alkali Earth Metal Atomic weight:137.33
Density @ 293 K:3.59 g/cm3 Atomic volume:39.24 cm3/mol
Discovered:

Barium was discovered by Sir Humphrey Davy in 1808 in London.

Barium States

State (s, l, g):solid
Melting point:998.2 K (725 °C) Boiling point:2170 K (1897 °C)

Barium Energies

Specific heat capacity:0.204 J g-1 K-1 Heat of atomization: 182 kJ mol-1
Heat of fusion: 7.12 kJ mol-1 Heat of vaporization : 140.3 kJ mol-1
1st ionization energy:502.9 kJ mol-1 2nd ionization energy:965.2 kJ mol-1
3rd ionization energy:3600 kJ mol-1 Electron affinity:14 kJ mol-1

Barium Oxidation & Electrons

Shells: 2,8,18,18,8,2 Electron configuration:[Xe] 6s2
Minimum oxidation number:0 Maximum oxidation number:2
Min. common oxidation no.:0 Max. common oxidation no.:2
Electronegativity (Pauling Scale):0.89 Polarizability volume:39.7 Å3

Barium Appearance & Characteristics

Structure:bcc (body-centred cubic) Color:silvery white
Hardness: 1.25 mohs
Harmful effects:

Barium compounds that are water or acid soluble are highly poisonous. Barium powder can ignite spontaneously in air.

Characteristics:

Barium is a metallic element chemically resembling calcium but more reactive. Barium oxidizes very easily in air and is also highly reactive with water or alcohol. Barium is most commonly found as the mineral barite (BaSO4) and witherite (BaCO3)


Uses:

Barium is used as a "flashed getter" in vacuum tubes to remove the last traces of gases. Barium is an important element in yttrium barium copper oxide (YBCO) superconductors. An alloy of barium with nickel is used in sparkplug wire.

Barium Reactions

Reaction with air:vigorous, w/ht ⇒ BaO, Ba2N3 Reaction with 6 M HCl:vigorous, ⇒ H2, BaCl2
Reaction with 15 M HNO3:mild, ⇒ Ba(NO3)2 Reaction with 6 M NaOH:passivated

Barium Compounds

Oxide(s):BaO, BaO2 Chloride(s):BaCl2
Hydride(s):BaH2

Barium Radius

Atomic radius:215 pm Ionic radius (1+ ion):pm
Ionic radius (2+ ion):149 pm Ionic radius (3+ ion):pm
Ionic radius (2- ion):pm Ionic radius (1- ion):pm

Barium Conductivity

Thermal conductivity:18.4 W m-1 K-1 Electrical conductivity:0.028 x 106 S cm-1

Barium Abundance & Isotopes

Abundance earth's crust:425 parts per million by weight, 41 parts per million by moles
Abundance solar system:parts per billion by weight, parts per billion by moles
Cost, pure: $55 per 100g
Cost, bulk:$ per 100g
Source:

Commercially obtained from the electrolysis of molten Barium Chloride, BaCl2

Isotopes:

Barium has 37 isotopes. Naturally occurring barium is a mixture of seven stable isotopes. 133Ba is the longest lived with a half-life of 10.51 years.

Barium Other

Other:

 


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