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Neptunium is a hard, silvery, ductile, radioactive actinide metal. In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium and below the lanthanide promethium. [8] Neptunium is a hard metal, having a bulk modulus of 118 GPa, comparable to that of manganese. [9]
Neptunium compounds are compounds containing the element neptunium (Np). Neptunium has five ionic oxidation states ranging from +3 to +7 when forming chemical compounds, which can be simultaneously observed in solutions. It is the heaviest actinide that can lose all its valence electrons in a stable compound.
Neptunium nitride is a binary inorganic compound of neptunium and nitrogen with the chemical formula NpN. [1] [2] ... Physical properties ... It is insoluble in water ...
Thus water behaves as though it is an ideal gas that is already under about 20,000 atmospheres (2 GPa) pressure, and explains why water is commonly assumed to be incompressible: when the external pressure changes from 1 atmosphere to 2 atmospheres (100 kPa to 200 kPa), the water behaves as an ideal gas would when changing from 20,001 to 20,002 ...
2 Physical properties. 3 References. ... Neptunium(IV) nitrate is an inorganic compound, ... It is soluble in water.
Solubility in water. ... Neptunium monocarbide is a binary compound of neptunium metal and carbon with the chemical formula NpC. [1] [2] ... Physical properties
Neptunium, 93 Np; Neptunium ... Physical properties; ... E172 would be the end of period 8 ("noble gas") and E173 would be the beginning of period 9. ...
Neptunium hexafluoride is stable in dry air but reacts vigorously with water. At normal pressure, it melts at 54.4 °C and boils at 55.18 °C. It is the only neptunium compound that boils at a low temperature. Due to these properties, it is possible to easily separate neptunium from spent fuel.