Neptunij
93
Np
Skupina
n/a
Perioda
7
Blok
f
Protons
Electrons
Neutrons
93
93
144
General Properties
Vrstno število
93
Atomska teža
[237]
Mass Number
237
Kategorija
Aktinoidi
Barva
Silver
Radioactive
Da
Named after the planet Neptune
Kristalna struktura
Primitivna ortorombska
Zgodovina
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.
Electrons per shell
2, 8, 18, 32, 22, 9, 2
Razporeditev elektronov
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Physical Properties
Faza snovi
Trdnina
Gostota
20,45 g/cm3
Tališče
910,15 K | 637 °C | 1178,6 °F
Vrelišče
4273,15 K | 4000 °C | 7232 °F
Talilna toplota
10 kJ/mol
Izparilna toplota
335 kJ/mol
Toplotna kapaciteta
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
CAS Number
7439-99-8
PubChem CID Number
n/a
Atomic Properties
Atomski polmer
155 pm
Kovalentni polmer
190 pm
Elektronegativnost
1,36 (Paulingova lestvica)
Ionization Potential
6,2657 eV
Atomic Volume
11,62 cm3/mol
Toplotna prevodnost
0,063 W/cm·K
Oksidacijska stanja
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.
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
Isotopes
Stable Isotopes
-Unstable Isotopes
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np