Neptunium
93
Np
Groep
n/a
Periode
7
Blok
f
Protrone
Elektrone
Neutrone
93
93
144
Algemene Eienskappe
Atoom Nommer
93
Atoommassa
[237]
Massa Nommer
237
Kategorie
Aktiniede
Kleur
Silver
Radioaktief
Ja
Named after the planet Neptune
Kristalstruktuur
Simple Orthorhombic
Geskiendenis
Neptunium was the first synthetic transuranium element of the actinide series to be discovered.
Neptunium was first produced by Edwin McMillan and Philip H. Abelson in 1940 at Berkeley Radiation Laboratory of the University of California.
The team produced the neptunium isotope 239Np by bombarding uranium with slow moving neutrons.
Neptunium was first produced by Edwin McMillan and Philip H. Abelson in 1940 at Berkeley Radiation Laboratory of the University of California.
The team produced the neptunium isotope 239Np by bombarding uranium with slow moving neutrons.
Elektrone per skil
2, 8, 18, 32, 22, 9, 2
Elektronkonfigurasie
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Fisiese Eienskappe
Fase
Soliede
Digtheid
20,45 g/cm3
Smeltpunt
910,15 K | 637 °C | 1178,6 °F
Kookpunt
4273,15 K | 4000 °C | 7232 °F
Heat of Fusion
10 kJ/mol
Heat of Vaporization
335 kJ/mol
Spesifieke Hitte Kapasiteit
-
Oorvloed in die aardkors
n/a
Oorvloed in die heelal
n/a
CAS Nommer
7439-99-8
PubChem CID Nommer
n/a
Atomiese Eienskappe
Atoom radius
155 pm
Kovalente Radius
190 pm
Elektronegatiewiteit
1,36 (Pauling scale)
Ionisasie potensiaal
6,2657 eV
Atoom volume
11,62 cm3/mol
Termiese geleidingsvermoë
0,063 W/cm·K
Oksidasiestate
3, 4, 5, 6, 7
Toepassings
Neptunium is used mainly for research purposes.
When bombarded with neutrons 237Np is used to produce 238Pu which is used for spacecraft generators and terrestrial navigation beacons.
237Np is used in devices for detecting high-energy neutrons.
When bombarded with neutrons 237Np is used to produce 238Pu which is used for spacecraft generators and terrestrial navigation beacons.
237Np is used in devices for detecting high-energy neutrons.
Neptunium is harmful due to its radioactivity
Isotope
Stabiele Isotope
-Onstabiele Isotope
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np