Нептуниум

93
Np
Група
Нема одговор
Периода
7
блок
f
Protons
Electrons
Neutrons
93
93
144
Општи Својства
Атомски број
93
Атомска тежина
[237]
Mass Number
237
Category
Актиноид
Color
Silver
Radioactive
Да
Named after the planet Neptune
Кристална структура
Simple Orthorhombic
History
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.
Electrons per shell
2, 8, 18, 32, 22, 9, 2
Електронска конфигурација
[Rn] 5f4 6d1 7s2
Np
Neptunium is obtained as a by-product from nuclear reactors
Физички Својства
Фаза
Solid
Густина
20,45 g/cm3
Точка на топење
910,15 K | 637 °C | 1178,6 °F
Точка на вриење
4273,15 K | 4000 °C | 7232 °F
Топлина на топење
10 kJ/mol
Топлина на испарување
335 kJ/mol
Specific Heat Capacity
-
Abundance in Earth's crust
Нема одговор
Abundance in Universe
Нема одговор
Edwin
Кредити на слика: scienceworld.ro
Edwin McMillan, one of the discoverer of the element
CAS Number
7439-99-8
PubChem CID Number
Нема одговор
Атомски Својства
Атомски полупречник
155 pm
Ковалентен полупречник
190 pm
Електронегативност
1,36 (Полингова скала)
Ionization Potential
6,2657 eV
Atomic Volume
11,62 cm3/mol
Thermal Conductivity
0,063 W/cm·K
Oxidation States
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
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