Neptunij
93
Np
Skupina
n/a
Perioda
7
Blok
f
Protoni
Elektroni
Neutroni
93
93
144
Opća svojstva
Atomski broj
93
Relativna atomska masa
[237]
Maseni broj
237
Kategorija
Aktinoidi
Boja
Srebrna
Radioaktivan
Da
Imenovan po planetu Neptunu
Kristalna struktura
Jednostavna ortorombična
Povijest
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.
Elektrona po ljusci
2, 8, 18, 32, 22, 9, 2
Elektronska konfiguracija
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
20,45 g/cm3
Talište
910,15 K | 637 °C | 1178,6 °F
Vrelište
4273,15 K | 4000 °C | 7232 °F
Toplina taljenja
10 kJ/mol
Toplina isparavanja
335 kJ/mol
Specifični toplinski kapacitet
-
Zastupljenost u Zemljinoj kori
n/a
Zastupljenost u svemiru
n/a
CAS broj
7439-99-8
PubChem CID broj
n/a
Atomska svojstva
Atomski radijus
155 pm
Kovalentni radijus
190 pm
Elektronegativnost
1,36 (Paulingova ljestvica)
Potencijal ionizacije
6,2657 eV
Atomski volumen
11,62 cm3/mol
Toplinska vodljivost
0,063 W/cm·K
Stanja oksidacije
3, 4, 5, 6, 7
Primjene
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
Izotopi
Stabilni izotopi
-Nestabilni izotopi
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np