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| rdfs:comment | - Neptunium is a synthetic radioactive element with a number of 93, and is an actinide.
- Neptunium is an ore that can be found on protocyte worlds (and several other biome types) and smelted into Neptunium rods in a fission furnace. It appears as a light purple ore similar to sulfur in appearance. It requires three ores to craft into a rod. Is also a fuel, each ore is 30 units.
- Neptunium (symbol Np) is a chemical element, atomic number 93 on the periodic table.
- In the United States, the 93rd element on the Periodic Table was dubbed "neputnium". However, in the Confederate States, physicist Henderson V. FitzBelmont named the element "saturnium". British scientists named the element "mosleyium" after Minister of War Oswald Mosley.
- Silvery in appearance, neptunium metal is fairly chemically reactive and is found in at least three allotropes: α-neptunium, orthorhombic, density 20.45 g/cm3 β-neptunium (above 280 °C), tetragonal, density (313 °C) 19.36 g/cm3 γ-neptunium (above 577 °C), cubic, density (600 °C) 18 g/cm3 237Np is fissionable. 237Np eventually decays to form bismuth-209, unlike most other common heavy nuclei which decay to make isotopes of lead. This decay chain is known as the neptunium series.
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| discoverer | - Edwin McMillan and Philip H. Abelson
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| Title | - File: 9-icon.pngFile: 3-icon.pngNeptuniumFile: Neptune icon.png
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| ImageCaption | - This is the mineral Aeschynite, which may or may not contain an atom of neptunium at any one time.
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| abstract | - Neptunium is a synthetic radioactive element with a number of 93, and is an actinide.
- Neptunium is an ore that can be found on protocyte worlds (and several other biome types) and smelted into Neptunium rods in a fission furnace. It appears as a light purple ore similar to sulfur in appearance. It requires three ores to craft into a rod. Is also a fuel, each ore is 30 units.
- Silvery in appearance, neptunium metal is fairly chemically reactive and is found in at least three allotropes: α-neptunium, orthorhombic, density 20.45 g/cm3 β-neptunium (above 280 °C), tetragonal, density (313 °C) 19.36 g/cm3 γ-neptunium (above 577 °C), cubic, density (600 °C) 18 g/cm3 19 neptunium radioisotopes have been characterized, with the most stable being 237Np with a half-life of 2.14 million years, 236Np with a half-life of 154,000 years, and 235Np with a half-life of 396.1 days. All of the remaining radioactive isotopes have half-lives that are less than 4.5 days, and the majority of these have half-lives that are less than 50 minutes. This element also has 4 meta states, with the most stable being 236mNp (t½ 22.5 hours). The isotopes of neptunium range in atomic weight from 225.0339 u (225Np) to 244.068 u (244Np). The primary decay mode before the most stable isotope, 237Np, is electron capture (with a good deal of alpha emission), and the primary mode after is beta emission. The primary decay products before 237Np are element 92 (uranium) isotopes (alpha emission produces element 91, protactinium) and the primary products after are element 94 (plutonium) isotopes. 237Np is fissionable. 237Np eventually decays to form bismuth-209, unlike most other common heavy nuclei which decay to make isotopes of lead. This decay chain is known as the neptunium series.
- Neptunium (symbol Np) is a chemical element, atomic number 93 on the periodic table.
- In the United States, the 93rd element on the Periodic Table was dubbed "neputnium". However, in the Confederate States, physicist Henderson V. FitzBelmont named the element "saturnium". British scientists named the element "mosleyium" after Minister of War Oswald Mosley.
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