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Neptunium is a hard metal, having a bulk modulus of 118 GPa, comparable to that of manganese. [9] Neptunium metal is similar to uranium in terms of physical workability. When exposed to air at normal temperatures, it forms a thin oxide layer. This reaction proceeds more rapidly as the temperature increases. [8]
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.
Physical properties; Phase at ... Spectral lines of neptunium: Other properties; ... E172 would be the end of period 8 ("noble gas") and E173 would be the beginning ...
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. 3 References. Toggle the table of contents. ... Neptunium(III) phosphide is a binary inorganic compound of neptunium metal and phosphorus with ...
the reaction of neptunium nitride with HCl: [3] 2 NpN + 8 HCl → N 2 + 4 H 2 + 2 NpCl 4. the reaction of neptunium sulfide with HCl: Np 2 S 3 + 8 HCl → 2 NpCl 4 + 3 H 2 S + H 2. the reaction of carbon tetrachloride with neptunium(IV) oxide or NpO 2. Neptunium tetrachloride is formed as a yellow sublimate. [4] NpO 2 + CCl 4 → NpCl 4 + CO 2 ...
Neptunium monocarbide is a binary compound of neptunium metal and carbon with the chemical formula NpC. [1] [2] Preparation ... Physical properties
Neptunium nitride is a binary inorganic compound of neptunium and nitrogen with the chemical formula NpN. [1] [2] Preparation ... Physical properties