Neptunio
93
Np
Grupo
Neniu
Perio
7
Bloko
f
Protonoj
Elektronoj
Neŭtronoj
93
93
144
Ĝeneralaj Propraĵoj
Atoma Nombro
93
Atommaso
[237]
Amasa Nombro
237
Kategorio
Aktinoidoj
Koloro
Arĝento
Radioaktiva
Jes
Named after the planet Neptune
Kristala Strukturo
Simpla Ortorombo
Historio
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.
Elektronoj per ŝelo
2, 8, 18, 32, 22, 9, 2
Elektrona Agordo
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Fizikaj Propraĵoj
Fazo
Solido
Denso
20,45 g/cm3
Fandpunkto
910,15 K | 637 °C | 1178,6 °F
Bolpunkto
4273,15 K | 4000 °C | 7232 °F
Varmo de Fuzio
10 kJ/mol
Varmo de Vaporiĝo
335 kJ/mol
Specifa Varmo Kapacito
-
Krusta Abundo
Neniu
Universa Abundo
Neniu
CAS Nombro
7439-99-8
PubChem Kunmetita Identiga Nombro
Neniu
Atomaj Propraĵoj
Atoma Radiuso
155 pm
Kovalenta Radiuso
190 pm
Elektronegativeco
1,36 (Pauling-skalo)
Potencialo de jonigo
6,2657 eV
Atoma Volumo
11,62 cm3/mol
Termika Kondukto
0,063 W/cm·K
Oksidaj Ŝtatoj
3, 4, 5, 6, 7
Aplikoj
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
Izotopoj
Stabilaj Izotopoj
-Malstabilaj Isotopoj
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np