Neptunium

93
Np
Kumpulan
Tiada
Kala
7
Blok
f
Proton
Elektron
Neutron
93
93
144
Ciri-Ciri Am
Nombor atom
93
Berat atom
[237]
Nombor jisim
237
Kategori
Aktinid
Warna
Perak
Radioaktif
Ya
Named after the planet Neptune
Struktur hablur
Orthorhombic Ringkas
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.
Bilangan elektron per petala
2, 8, 18, 32, 22, 9, 2
Konfigurasi elektron
[Rn] 5f4 6d1 7s2
Np
Neptunium is obtained as a by-product from nuclear reactors
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
20.45 g/cm3
Takat lebur
910.15 K | 637 °C | 1178.6 °F
Takat didih
4273.15 K | 4000 °C | 7232 °F
Haba pelakuran
10 kJ/mol
Haba pengewapan
335 kJ/mol
Muatan haba molar
-
Banyak pada kerak bumi
Tiada
Banyak pada alam semesta
Tiada
Edwin
Kredit imej: scienceworld.ro
Edwin McMillan, one of the discoverer of the element
Nombor CAS
7439-99-8
PubChem CID Number
Tiada
Ciri-Ciri Atom
Jejari atom
155 pm
Jejari kovalen
190 pm
Keelektronegatifan
1.36 (Skala Pauling)
Kebolehan mengion
6.2657 eV
Isipadu atom
11.62 cm3/mol
Daya pengaliran terma
0.063 W/cm·K
Keadaan pengoksidaan
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.
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