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Properties of substance:

protoactinium

Group of substances:

inorganic

Physical appearance:

metal

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

Pa

Structural formula as text:

Pa

Molar/atomic mass: 231.0359

Melting point (°C):

1572

Boiling point (°C):

4487

Numerical data:

Year of discovery: 1917
Superconducting temperature (K): 1.4

Density:

15.37 (20°C, g/cm3)

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

16.7

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

481

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 580 [Russian]
  2. Пальшин Е.С., Мясоедов Б.Ф., Давыдов А.В. Аналитическая химия протактиния. - М.: Наука, 1968. - pp. 16-17 [Russian]
  3. Успехи химии. - 1960. - Т.29, №7. - pp. 882-898 [Russian]
  4. Успехи химии. - 1966. - Т.35, №3. - pp. 460-486 [Russian]
  5. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 111 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru