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Properties of substance:

radium

Group of substances:

inorganic

Physical appearance:

cubic metal

Empirical formula (Hill's system for organic substances):

Ra

Structural formula as text:

Ra

Molar/atomic mass: 226.0254

Melting point (°C):

969

Boiling point (°C):

1507

Solubility (g/100 g of solvent):

water: reaction [Ref.]

Numerical data:

Year of discovery: 1898
Ionization Potentials (Electronvolts): 5.277
Ionization Potentials (Electronvolts): 10.144

Density:

6 (20°C, g/cm3)

Reactions:

  1. [Ref.1, Ref.2]
    Ra + 2H2O → Ra(OH)2 + H2

Electrode potential:

Ra2+ + 2e- → Ra, E = -2.8 V (water, 25°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

0 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

0 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

69.1 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

29.3 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

8

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

149.6

ΔHsublimation (kJ/mol):

157.9

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

162 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

176.3 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

20.786 (g)

References:

  1. Бекман И.Н. Радиохимия. Том II: Радиоактивные элементы. - М.: Издатель Мархитин П.Ю., 2014. - pp. 94-107 [Russian]
  2. Вдовенко В.М., Дубасов Ю.В. Аналитическая химия радия. - Л.: Наука, 1973. - pp. 24-25 [Russian]
  3. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
  4. Краткая химическая энциклопедия. - Т. 4: Пирометаллургия-С. - М.: Советская энциклопедия, 1965. - pp. 435-438 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 91 [Russian]
  6. Рипан Р., Четяну И. Неорганическая химия. - Т.1. - М.: Мир, 1971. - pp. 259-260 [Russian]
  7. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 153-154 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru