›› Physical and chemical properties of Protactinium

Atomic Number:91
Element Symbol:Pa
Element Name:Protactinium
Atomic Weight:231.03588
Group Name:Actinoid
Period Number:7 (actinoid)
Ground State Configuration:[Rn] 5f2 6d 7s2
Ground State Level:4K11/2
Standard State:Solid
Bond Length:321.2
Atomic Radius Empirical:180
First Ionization Energy:568
Pauling Electronegativity:1.5
Allred Rochow Electronegativity:1.14
Density Of Solid:15370
Molar Volume:15.18
Electrical Resistivity:18
Melting Point:1568
Superconduction Temperature:-271.7
Thermal Conductivity:47
Enthalpy Of Fusion:15
Enthalpy Of Vaporization:470
Enthalpy Of Atmization:607
Most Common Oxidation Numbers:5
Color:Silvery metallic
Discovered By:Otto Hahn, Lise Meitner, Frederick Soddy, John Cranston
Discovered At:Germany, England
Discovered When:1913
Origin Of Name:From the Greek word protos meaning first

Calculate the molecular weight of Protactinium or molecular weight Pa.

Also see the full list of chemical elements and atomic weights.

››Compounds that contain Protactinium

Protactinium(IV) Bromide  PaBr4
Protactinium(V) Bromide  PaBr5
Protactinium(IV) Chloride  PaCl4
Protactinium(V) Chloride  PaCl5
Protactinium(IV) Fluoride  PaF4
Protactinium(V) Fluoride  PaF5
Protactinium(III) Iodide  PaI3
Protactinium(IV) Iodide  PaI4
Protactinium(V) Iodide  PaI5
Protactinium(II) Oxide  PaO
Protactinium(IV) Oxide  PaO2
Protactinium(V) Oxide  Pa2O5