Protactinium

Protactinium General

Name:Protactinium	Symbol:Pa
Type:Rare Earth, Actinides	Atomic weight:231.0359
Density @ 293 K:15.4 g/cm3	Atomic volume:15.0 cm3/mol
Discovered: 1917

Protactinium States

State (s, l, g): solid
Melting point:1873.2 K	Boiling point:4500 K

Protactinium Energies

Specific heat capacity:0.12 J/gK	Heat of atomization:527 kJ/mole atoms
Heat of fusion: 12.30 kJ/mol	Heat of vaporization :
1st ionization energy:568 kJ/mole	2nd ionization energy:kJ/mole
3rd ionization energy:kJ/mole	Electron affinity:kJ/mole

Protactinium Oxidation & Electrons

Shells: 2,8,18,32,20,9,2	Electron configuration:[Rn] 5f2 6d1 7s2
Minimum oxidation number:0	Maximum oxidation number:5
Min. common oxidation no.:0	Max. common oxidation no.:5
Electronegativity (Pauling Scale):1.5	Polarizability volume:25.4 Å3

Protactinium Appearance & Characteristics

Structure:fcc: face-centered cubic	Color:silvery
Hardness:mohs
Harmful effects:
Characteristics: Radioactive Uses:

Protactinium Reactions

Reaction with air:	Reaction with 6 M HCl:
Reaction with 15 M HNO3:	Reaction with 6 M NaOH:none

Protactinium Compounds

Oxide(s):PaO PaO2 Pa2O5	Chloride(s):PaCl4 PaCl5
Hydride(s):PaH3

Protactinium Radius

Atomic radius:163 pm	Ionic radius (1+ ion):pm
Ionic radius (2+ ion):pm	Ionic radius (3+ ion):118 pm
Ionic radius (2- ion):pm	Ionic radius (1- ion):pm

Protactinium Conductivity

Thermal conductivity:J/m-sec-deg

Electrical conductivity:1/mohm-cm

Protactinium Abundance & Isotopes

Abundance earth's crust:-5.9 log

Abundance solar system:log

Cost, pure: $/100g

Cost, bulk: $/100g

Source: Synthetic(U-235 decay)

Isotopes: 1

Protactinium Other

Other:

Prev: Thorium Next: Uranium