WebElements Periodic Table » Neptunium (original) (raw)
Neptunium - 93Np: the essentials
Name: neptunium
Symbol: Np
Atomic number: 93
Relative atomic mass (_A_r): [ 237 ] (longest lived isotope)
Standard state: solid at 298 K
Appearance: silvery metallic
Classification: Metallic
Group name: Actinoid
Period in periodic table: 7 (actinoid)
Shell structure: 2.8.18.32.22.9.2
CAS Registry: 7439-99-8
Neptunium atoms have 93 electrons and the shell structure is 2.8.18.32.22.9.2. The ground state electronic configuration of neutral neptunium is [Rn].5f4.6d1.7s2 and the term symbol of neptunium is 6L11/2.
Neptunium: description
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Neptunium is a radioactive rare earth metal and has at least 3 allotropic forms. It is named for the planet Neptune. Np-237 is a by-product from nuclear reactors.
Neptunium: binary compounds
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of neptunium where known.
Neptunium: compound properties
Bond strengths; lattice energies of neptunium halides, hydrides, oxides (where known); and reduction potentials where known.