Neptünyum
93
Np
Grup
yok
Periyot
7
Blok
f
Protonlar
Elektronlar
Nötronlar
93
93
144
Temel Özellikleri
Atom numarası
93
Atom ağırlığı
[237]
Kütle Numarası
237
Kategori
Aktinit
Renk
Gümüşi
Radyoaktif
Evet
Named after the planet Neptune
Kristal yapısı
Basit ortorombik
Tarihi
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.
Enerji seviyesi başına Elektronlar
2, 8, 18, 32, 22, 9, 2
Elektron dizilimi
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Fiziksel Özellikleri
Faz
Katı
Yoğunluk
20,45 g/cm3
Ergime noktası
910,15 K | 637 °C | 1178,6 °F
Kaynama noktası
4273,15 K | 4000 °C | 7232 °F
Ergime ısısı
10 kJ/mol
Buharlaşma ısısı
335 kJ/mol
Isı kapasitesi
-
Dünya kabuğundaki bulunulabilirliği
yok
Evrendeki bulunulabilirliği
yok
CAS Numarası
7439-99-8
PubChem CID Numarası
yok
Atom Özellikleri
Atom yarıçapı
155 pm
Kovalent yarıçapı
190 pm
Elektronegatifliği
1,36 (Pauling ölçeği)
İyonlaşma enerjisi
6,2657 eV
Atomik Hacim
11,62 cm3/mol
Isıl iletkenlik
0,063 W/cm·K
Yükseltgenme seviyeleri
3, 4, 5, 6, 7
Uygulamalar
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
İzotoplar
Kararlı izotoplar
-Kararsız izotoplar
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np