Neptunium

93
Np
Grupp
n/a
Period
7
Block
f
Protoner
Electrons
Neutroner
93
93
144
Generella Egenskaper
Atomnummer
93
Atommassa
[237]
Mass Number
237
Kategori
Aktinider
Färg
Silver
Radioaktiv
Ja
Named after the planet Neptune
Kristallstruktur
Enkelt ortorombiskt
Historia
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.
Elektroner per skal
2, 8, 18, 32, 22, 9, 2
Elektronkonfiguration
[Rn] 5f4 6d1 7s2
Np
Neptunium is obtained as a by-product from nuclear reactors
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
20,45 g/cm3
Smältpunkt
910,15 K | 637 °C | 1178,6 °F
Kokpunkt
4273,15 K | 4000 °C | 7232 °F
Smältvärme
10 kJ/mol
Ångbildningsvärme
335 kJ/mol
Specifik värmekapacitet
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Edwin
Bildkrediter: scienceworld.ro
Edwin McMillan, one of the discoverer of the element
CAS Number
7439-99-8
PubChem CID Number
n/a
Atomära Egenskaper
Atomradie
155 pm
Kovalent radie
190 pm
Elektronegativitet
1,36 (Paulingskalan)
Jonisationspotential
6,2657 eV
Molvolym
11,62 cm3/mol
Värmeledningsförmåga
0,063 W/cm·K
Oxidationstillstånd
3, 4, 5, 6, 7
Applications
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
Isotoper
Stabila isotoper
-
Instabila isotoper
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np