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| General
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| Name, Symbol, Number
| protactinium, Pa, 91
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| Chemical series
| Transition metals
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| Group, Period, Block
| _ , 7, f
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| Density, Hardness
| 15370 kg/m3Kilogram per cubic metre is the SI measure of density and is represented as kg/m³, where kg stands for kilogram and m³ stands for cubic metre. The density of water is about 1000 kg/m³, since a cubic metre of water weighs about a tonne. kg/m³" is sometimes, no data
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| AppearanceFor alternative meanings, see color (disambiguation). visual arts. Color (or colour is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. The perception of
| bright, silvery metallic luster
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| Atomic properties
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| Atomic weightIn reference to a certain isotope of a chemical element, atomic weight (more accurately relative atomic mass though also called simply atomic mass is the mass of one atom of the isotope expressed in units atomic mass unit amu) such that the Carbon-12 isot
| 231.03588(2) amuTo help compare different orders of magnitude we list here masses between 60. 22 amu and 602. 2 amu (10-25 kg and 10-24 kg). See also masses of other orders of magnitude. lighter masses 91. 224 amu atomic mass of zirconium 92. 90638 amu atomic mass of nio
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| Atomic radiusAtomic radius is the distance from the atomic nucleus to the outmost stable electron orbital in a atom that is at equilibrium and is measured in picometers or Angstroms. Atomic radii are called covalent radii (a reference to the types of bonds formed) whe (calc.)
| 180 (no data) pmTo help compare different orders of magnitude this page lists lengths between 100 pm and 1 nm (10-10 m and 10-9 m). See also lengths of other orders of magnitude. Lengths shorter than 100 pm 100 pm 1 Angstrom 100 pm (0. 1 nm) covalent radius of sulfur ato
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| Covalent radiusCovalent radius in chemistry corresponds to half of the distance between two identical atomic nuclei, bound by a covalent bond. It is expressed in terms of pm or A. Chemistry.
| no data
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| van der Waals radius
| no data
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| Electron configuration
| [ Rn]7s²5f²6d¹
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| e- 's per energy level
| 2, 8, 18, 32, 20, 9, 2
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| Oxidation states ( Oxide)
| 5 (weak base)
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| Crystal structure
| orthorhombic
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| Physical properties
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| State of matter
| solid
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| Melting point
| 2113 K (2912 ° F)
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| Boiling point
| 4300 K (7281 °F)
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| Molar volume
| 15.18 ×10-3 m3/mol
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| Heat of vaporization
| 470 kJ/mol
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| Heat of fusion
| 15 kJ/mol
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| Vapor pressure
| 5.1E-5 Pa at 2200 K
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| Velocity of sound
| no data
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| Miscellaneous
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| Electronegativity
| 1.5 ( Pauling scale)
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| Specific heat capacity
| 120 J/(kg*K)
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| Electrical conductivity
| 5.29 106/m ohm
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| Thermal conductivity
| 47 W/(m*K)
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| 1st ionization potential
| 568 kJ/mol
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| 2nd ionization potential
| no data
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| 3rd ionization potential
| no data
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| 4th ionization potential
| no data
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| Most stable isotopes
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| SI units & STP are used except where noted.
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