Neptunyo

Gikan sa Wikipedia, ang gawasnong ensiklopedya
Neptunium
93Np
Pm

Np

(Uqp)
uraniumneptuniumplutonium
Appearance
silvery metallic
General properties
Name, simbolo, kaiphan neptunium, Np, 93
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category aktinido
Group, period, block [[group {{{group}}} element|{{{group}}}]], 7, f
Standard atomic weight (237)
Electron configuration [Rn] 5f4 6d1 7s2
2, 8, 18, 32, 22, 9, 2
Electron shells of neptunium (2, 8, 18, 32, 22, 9, 2)
History
Discovery Edwin McMillan and Philip H. Abelson (1940)
Physical properties
Phase magahi
Density (near r.t.) 20.45[1] g·cm−3
Melting point 910 K, 637 °C, 1179 °F
Boiling point 4273 K, 4000 °C, 7232 °F
Heat of fusion 3.20 kJ·mol−1
Heat of vaporization 336 kJ·mol−1
Molar heat capacity 29.46 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2194 2437        
Atomic properties
Oxidation states 7, 6, 5, 4, 3
(amphoteric oxide)
Electronegativity 1.36 (Pauling scale)
Ionization energies 1st: 604.5 kJ·mol−1
Atomic radius 155 pm
Covalent radius 190±1 pm
Miscellanea
Crystal structure orthorhombic
Neptunium has a orthorhombic crystal structure
Magnetic ordering paramagnetic[2]
Electrical resistivity (22 °C) 1.220 µΩ·m
Thermal conductivity 6.3 W·m−1·K−1
CAS registry number 7439-99-8
Most stable isotopes
Main article: Isotopes of neptunium
iso NA half-life DM DE (MeV) DP
235Np syn 396.1 d α 5.192 231Pa
ε 0.124 235U
236Np syn 1.54×105 y ε 0.940 236U
β 0.940 236Pu
α 5.020 232Pa
237Np trace 2.144×106 y SF & α 4.959 233Pa
239Np trace 2.356 d β 0.218 239Pu
t  h  u
· r

Ang neptunyo (Iningles neptunium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Np ug kaiphan nga atomik 93. Ang neptunyo mao ang aktinido.

Ang mga gi basihan niini[usba | edit source]

  1. Criticality of a 237Np Sphere
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.


Galeriya sa hulagway[usba | edit source]