Neptunium element (Np) is in period 7 of a periodic table. Neptunium is in the f-block and it is classified as an actinide on the periodic table.
There is a lot more information related to neptunium which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Neptunium element (Information Table)
- Neptunium element in Periodic table
- Facts about Neptunium
- Properties of Neptunium
- Uses of Neptunium
Neptunium Element (Information Table)
The important data related to neptunium element is given in the table below.
|Appearance of neptunium||Silvery metallic|
|Atomic number of neptunium||93|
|Symbol of neptunium||Np|
|Atomic mass of neptunium (most stable isotope)||237 u|
|Protons, Neutrons & Electrons in neptunium||Protons: 93, Neutrons: 144, Electrons: 93|
|State of neptunium (at STP)||Solid|
|Period number of neptunium in periodic table||7|
|Block of neptunium in periodic table||f-block|
|Category of neptunium||Inner transition metals|
|Bohr model or Electrons per shell or Electrons arrangement in neptunium||2, 8, 18, 32, 22, 9, 2|
|Electron configuration of neptunium||[Rn] 5f4 6d1 7s2|
|Orbital diagram of neptunium|
|Atomic radius of neptunium (van der Waals radius)||237 picometers|
|Density of neptunium||20.45 g/cm3|
|1st ionization energy of neptunium||6.266 eV|
|Main isotope of neptunium||237Np|
|Crystal structure of neptunium||Orthorhombic|
|Discovery of neptunium||By Edwin McMillan and Philip Abelson (in 1940)|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Neptunium element in Periodic table
The Neptunium element (Np) has the atomic number 93 and is located in period 7. Neptunium is a metal and it is classified as an actinide group element.
Click on above elements in the periodic table to see their information.
Facts about neptunium
Here are a few interesting facts about the neptunium element.
- Edwin McMillan and Philip Abelson discovered neptunium in the year 1940.
- Neptunium was given its name from the planet “Neptune”.
- The radioactive isotope of neptunium (237Np) has the longest half-life of around 2.14 million years.
- Out of all the elements on the periodic table, neptunium is the 5th most dense element.
- Neptunium is a radioactive element and it is also toxic for humans.
Properties of neptunium
Here is a list of some physical properties and chemical properties of neptunium.
Physical properties of neptunium
- Neptunium has a silvery white metallic appearance.
- The density of neptunium is 20.45 g/cm3 and the atomic mass of its most stable isotope is 237 amu.
- The atomic radius (van der Waals) of neptunium is 221 picometers.
- Neptunium has orthorhombic crystal structure.
Chemical properties of neptunium
- Neptunium reacts with the atmospheric oxygen and forms a thin oxide layer on it.
- The electron configuration of neptunium ([Rn] 5f4 6d1 7s2) shows that the last electron enters the f-orbital and hence it is f-block element.
- Neptunium has variable oxidation states ranging from +3 to +7, but its most common oxidation state is +5.
Uses of neptunium
Here are some uses of the neptunium element.
- Neptunium is a radioactive element and hence it has no commercial uses.
- Neptunium is generally used in research work.
- Neptunium can be used to produce plutonium.
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- C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – NEPTUNIUM. (n.d.). C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – NEPTUNIUM. https://pubsapp.acs.org/cen/80th/neptunium.html?
- D. (2005, November 29). Getting the Neptunium out of Nuclear Waste – Berkeley Lab. Berkeley Lab News Center. https://newscenter.lbl.gov/2005/11/29/getting-the-neptunium-out-of-nuclear-waste/
- Prohaska, T., et al. (2022, May 1). Standard atomic weights of the elements 2021 (IUPAC Technical Report). Pure and Applied Chemistry, 94(5), 573–600. https://doi.org/10.1515/pac-2019-0603
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- Kaye, G W.C., & Laby, T H. Tables of physical and chemical constants. 15th Edition. United States.
- Sansonetti, J. E., & Martin, W. C. (2005, December). Handbook of Basic Atomic Spectroscopic Data. Journal of Physical and Chemical Reference Data, 34(4), 1559–2259. https://doi.org/10.1063/1.1800011
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