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Neptunium metal is silvery and tarnishes when exposed to air. The element occurs in three allotropic forms and it normally exhibits five oxidation states, ranging from +3 to +7. Like all actinides, it is radioactive, poisonous, pyrophoric, and capable of accumulating in bones, which makes the handling of neptunium dangerous.
Neptunium also forms a large number of oxide compounds with a wide variety of elements, although the neptunate oxides formed with alkali metals and alkaline earth metals have been by far the most studied. Ternary neptunium oxides are generally formed by reacting NpO 2 with the oxide of another element or by precipitating from an alkaline solution.
At last count 96/97 of the 97 elements (hydrogen through einsteinium, except astatine and francium) isolated in pure form and in macroscopic quantities have images.; There are few images of very low encyclopedic quality for which it should be relatively easy to obtain higher quality: Ca.
Spectral lines of neptunium: Other properties; Natural occurrence: from decay: Crystal structure ... Some data, like standard atomic weight, are read from a central ...
Pages in category "Neptunium" The following 8 pages are in this category, out of 8 total. This list may not reflect recent changes. ...
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Neptunium (93 Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given. Like all trace or artificial elements, it has no stable isotopes. The first isotope to be synthesized and identified was 239 Np in 1940, produced by bombarding 238 U with neutrons to produce ...
Image credits: Green____cat Cyber and media psychologist Mayra Ruiz-McPherson, PhD(c), MA, MFA, explains that broadly speaking, "negative news" can describe two kinds of events and happenings ...