錼
93
Np
族
無法計量
週期
7
區
f
個質子
電子
個中子
93
93
144
一般屬性
原子序數
93
標準原子質量
[237]
品質編號
237
類別
錒系元素
顏色
銀色
放射性
是
Named after the planet Neptune
晶體結構
簡單矯形
歷史
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.
每個外殼的電子
2, 8, 18, 32, 22, 9, 2
電子排布
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
物理性質
物態
固體
密度
20.45 g/cm3
熔點
910.15 K | 637 °C | 1178.6 °F
沸點
4273.15 K | 4000 °C | 7232 °F
熔化熱
10 kJ/mol
汽化熱
335 kJ/mol
比熱容
-
地殼豐度
無法計量
宇宙豐度
無法計量
CAS 編號
7439-99-8
Pubchem CID 編號
無法計量
原子性質
原子半徑
155 pm
共價半徑
190 pm
電負性
1.36 (鲍林标度)
電離電位
6.2657 eV
原子體積
11.62 cm3/mol
熱導率
0.063 W/cm·K
氧化態
3, 4, 5, 6, 7
應用
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
同位素
穩定同位素
-不穩定同位素
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np