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Properties of NpO2

Properties of NpO2 (Neptunium(IV) oxide):

Compound NameNeptunium(IV) oxide
Chemical FormulaNpO2
Molar Mass268.04537 g/mol

Chemical structure
NpO2 (Neptunium(IV) oxide) - Chemical structure
Lewis structure
3D molecular structure
Physical properties
AppearanceGreen cubic crystals
Density11.1000 g/cm³
Helium 0.0001786
Iridium 22.562
Thermochemistry
Enthalpy of Formation-256.70 kJ/mol
Adipic acid -994.3
Tricarbon 820.06
Standard Entropy19.19 J/(mol·K)
Ruthenium(III) iodide -247
Chlordecone 764

Alternative Names

Neptunium oxide, neptunium dioxide

Elemental composition of NpO2
ElementSymbolAtomic weightAtomsMass percent
NeptuniumNp236.04657188.0622
OxygenO15.9994211.9378
Mass Percent CompositionAtomic Percent Composition
Np: 88.06%O: 11.94%
Np Neptunium (88.06%)
O Oxygen (11.94%)
Np: 33.33%O: 66.67%
Np Neptunium (33.33%)
O Oxygen (66.67%)
Mass Percent Composition
Np: 88.06%O: 11.94%
Np Neptunium (88.06%)
O Oxygen (11.94%)
Atomic Percent Composition
Np: 33.33%O: 66.67%
Np Neptunium (33.33%)
O Oxygen (66.67%)
Identifiers
CAS Number12035-79-9
SMILES[O-2].[O-2].[Np+4]
Hill formulaNpO2

Related
Molecular weight calculator
Oxidation state calculator

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