Neptunium

93
Np
Gruppe
n/a
Periode
7
Block
f
Protonen
Elektronen
Neutronen
93
93
144
Generelle Eigenschaften
Ordnungszahl
93
Atommasse
[237]
Massenzahl
237
Kategorie
Actinoide
Farbe
Silber
Radioaktiv
Ja
Named after the planet Neptune
Kristallstruktur
Einfach orthorhombisch
Geschichte
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.
Elektronen pro Schale
2, 8, 18, 32, 22, 9, 2
Elektronenkonfiguration
[Rn] 5f4 6d1 7s2
Np
Neptunium is obtained as a by-product from nuclear reactors
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
20,45 g/cm3
Schmelzpunkt
910,15 K | 637 °C | 1178,6 °F
Siedepunkt
4273,15 K | 4000 °C | 7232 °F
Schmelzwärme
10 kJ/mol
Verdampfungswärme
335 kJ/mol
Spezifische Wärmekapazität
-
Häufigkeit in der Erdkruste
n/a
Häufigkeit im Universum
n/a
Edwin
Danksagungen für Bilder: scienceworld.ro
Edwin McMillan, one of the discoverer of the element
CAS-Nummer
7439-99-8
PubChem CID Number
n/a
Atomeigenschaften
Atomradius
155 pm
Kovalenter Radius
190 pm
Elektronegativität
1,36 (Pauling-Skala)
Ionisierungsenergie
6,2657 eV
Molares Volumen
11,62 cm3/mol
Wärmeleitfähigkeit
0,063 W/cm·K
Oxidationszustände
3, 4, 5, 6, 7
Anwendung
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.
Neptunium is harmful due to its radioactivity
Isotope
Stabile Isotope
-
Instabile Isotope
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np