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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 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.
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.
2 Physical properties. ... Solubility in water. ... Neptunium monocarbide is a binary compound of neptunium metal and carbon with the chemical formula NpC. [1] [2]
2 Physical properties. 3 References. ... Neptunium (III) phosphide is a ... It is insoluble in water. It is antiferromagnetic below 130 K. [4] [5] References
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 nitride is a binary inorganic compound of neptunium and nitrogen with the chemical formula NpN. [1] [2] ... Physical properties ... It is insoluble in water ...
Although hydrogen bonding is a relatively weak attraction compared to the covalent bonds within the water molecule itself, it is responsible for several of the water's physical properties. These properties include its relatively high melting and boiling point temperatures: more energy is required to break the hydrogen bonds between water molecules.