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:
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Characteristics:
Radioactive Uses:
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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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