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Neptunium

Neptunium General

Name:Neptunium Symbol:Np
Type:Rare Earth, Actinides Atomic weight:237.0482
Density @ 293 K:20.45 g/cm3 Atomic volume:11.62 cm3/mol
Discovered:

1940

Neptunium States

State (s, l, g):solid
Melting point:913.2 K Boiling point: 4175 K

Neptunium Energies

Specific heat capacity:0.12 J/gK Heat of atomization:kJ/mole atoms
Heat of fusion:5.190 kJ/mol Heat of vaporization :
1st ionization energy:597 kJ/mole 2nd ionization energy:kJ/mole
3rd ionization energy:kJ/mole Electron affinity:kJ/mole

Neptunium Oxidation & Electrons

Shells:2,8,18,32,23,8,2 Electron configuration:[Rn] 5f4 6d1 7s2
Minimum oxidation number:0 Maximum oxidation number:7
Min. common oxidation no.:0 Max. common oxidation no.:5
Electronegativity (Pauling Scale):1.3 Polarizability volume:24.8 Å3

Neptunium Appearance & Characteristics

Structure:special: complex Color:silvery
Hardness:mohs
Harmful effects:

 

Characteristics:

Radioactive


Uses:

 

Neptunium Reactions

Reaction with air: Reaction with 6 M HCl:
Reaction with 15 M HNO3: Reaction with 6 M NaOH:

Neptunium Compounds

Oxide(s):NpO NpO2 Np2O5 Chloride(s):NpCl3 NpCl4
Hydride(s):NpH2 NpH3

Neptunium Radius

Atomic radius:155 pm Ionic radius (1+ ion):pm
Ionic radius (2+ ion):124 pm Ionic radius (3+ ion):115 pm
Ionic radius (2- ion):pm Ionic radius (1- ion):pm

Neptunium Conductivity

Thermal conductivity: 6.3 J/m-sec-deg Electrical conductivity:1/mohm-cm

Neptunium Abundance & Isotopes

Abundance earth's crust:log
Abundance solar system: log
Cost, pure:$/100g
Cost, bulk:$/100g
Source:

Synthetic

Isotopes:

0

Neptunium Other

Other:

 


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