Neptunium
93
Np
Golongan
n/a
Periode
7
Blok
f
Proton
Elektron
Neutron
93
93
144
Sifat Umum
Nomor atom
93
Massa atom
[237]
Nomor massa
237
Kategori
Aktinida
Warna
Perak
Radioaktif
Ya
Named after the planet Neptune
Struktur kristal
Ortorombik Sederhana
Sejarah
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.
Elektron per kulit
2, 8, 18, 32, 22, 9, 2
Konfigurasi elektron
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Sifat Fisika
Fase
Solid
Kepadatan
20,45 g/cm3
Titik lebur
910,15 K | 637 °C | 1178,6 °F
Titik didih
4273,15 K | 4000 °C | 7232 °F
Kalor peleburan
10 kJ/mol
Kalor penguapan
335 kJ/mol
Kapasitas kalor molar
-
Kelimpahan di kerak bumi
n/a
Kelimpahan di alam semesta
n/a
Nomor CAS
7439-99-8
Nomor PubChem CID
n/a
Sifat Atom
Jari-jari atom
155 pm
Jari-jari kovalen
190 pm
Elektronegativitas
1,36 (Skala Pauling)
Potensi Ionisasi
6,2657 eV
Volume atom
11,62 cm3/mol
Kondusivitas termal
0,063 W/cm·K
Bilangan oksidasi
3, 4, 5, 6, 7
Aplikasi
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
Isotop
Isotop stabil
-Isotop tidak stabil
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np