Neptunium has an atomic number of 93, present in the actinide series of on the Periodic Table. Neptunium metal is silvery and tarnishes when exposed to air. Number of natural isotopes (atoms of the same element with a different number of neutrons): 4 — Neptunium-237 through neptunium-240. The chemical symbol for Neptunium is Np . Neptunium Properties. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. 20.25 at 20°C; valence +3, +4, +5, or +6. Neptunium was first produced by Edwin M. McMillian and Philip H. Abelson, working at the University of California, Berkeley, in 1940.They produced neptunium-239, an isotope of neptunium with a half-life of about 2.4 days, by bombarding uranium with slow moving neutrons.. Neptunium's most stable isotope, neptunium-237, has a half-life of about 2,144,000 years. Of all actinoids, neptunium is the element with the highest density. Neptunium metal is silvery and tarnishes when exposed to air. The most stable of these is neptunium-237, with a half-life of 2.14 million years Properties: Neptunium has a melting point of 913.2 K, boiling point of 4175 K, heat of fusion of 5.190 kJ/mol, sp. Neptunium (93 Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given. Atomic Number of Neptunium. Therefore you can directly look for atomic number 93 to find Neptunium on periodic table. The atomic number increases from left to right. Isotopes: 20 isotopes of Neptunium are known. It is a ductile metal that forms a number of chemical compounds. The number of electrons in each of Neptunium's shells is 2, 8, 18, 32, 22, 9, 2 and its electron configuration is [Rn] 5f 4 6d 1 7s 2.The neptunium atom has a Van der Waals radius of 221.pm. Atomic Number of Neptunium. Neptunium has the atomic symbol Np, atomic number 93, and atomic weight 237. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. It is a fairly reactive metal with silvery color, and at least 3 allotropes exist. There … Its electronic configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 6 4f 14 5d 10 6s 2 6p 6 5f 4 6d 1 7s 2 or it can be written as [Rn] 5f 4 6d 1 7s 2. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. The chemical symbol for Neptunium is Np. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Neptunium is a silvery, ductile, radioactive metal. It has 93 protons and 93 electrons. The most stable are Np-237 with a half-life of 2.14 million years; Np-236 with a half-life of 154,000 years; and Np-235 with a half-life of 396 days. There are 25 known radioactive isotopes of neptunium ranging in atomic weights from 225 to 244 with 5 of those as metastable isotopes. The chemical symbol for Neptunium is Np . Atomic number of Neptunium is 93. 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 239 U, which then underwent beta decay to 239 Np. The chemical symbol for Neptunium is Np.. Atomic Mass of Neptunium. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Neptunium (atomic number 93, symbol Np) is a radioactive element belonging to the actinide series. Like its two closest neighbours, it belongs to the actinide series, so … Neptunium is found between uranium (92), the last of the natural elements, and plutonium (94). Atomic mass of Neptunium is 237 u. 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