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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:

 


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