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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 is the heaviest element for which the location of the proton drip line is known; ... Neptunium-236 has 143 neutrons and a half-life of 154,000 years.
This list includes all numbered trans-Neptunian objects with a semi-major axis greater than 30.1 astronomical units (AU), Neptune's average orbital distance from the Sun. The data is sourced from MPC's "List of Trans Neptunian Objects" and "List Of Centaurs and Scattered-Disk Objects", in addition to MPC's "List of Neptune Trojans", completed with remarks and information from Johnston's ...
Trace amounts of neptunium and plutonium form in some uranium ... berkelium, Bk, named after Berkeley, where the University of California, Berkeley is located (1949).
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.
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.
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A trans-Neptunian object (TNO), also written transneptunian object, [1] is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has an orbital semi-major axis of 30.1 astronomical units (AU).