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Neptunium
93Np
Pm

Np

(Uqt)
uraniumneptuniumplutonium
Ìhànsójú
silvery metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà neptunium, Np, 93
Ìpèlóhùn /nɛpˈtjuːniəm/
nep-TEW-nee-əm
Ẹ̀ka ẹ́límẹ̀nti actinide
Ẹgbẹ́, àsìkò, àdìpò n/a7, f
Ìwúwo átọ́mù (237)
Ìtòléra ẹ̀lẹ́ktrónì [Rn] 7s2 6d1 5f4
2, 8, 18, 32, 22, 9, 2
Physical properties
Phase solid
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
3 forms: orthorhombic,
tetragonal and cubic
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù 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 syn 2.144×106 y SF & α 4.959 233Pa
· r

Nẹ́ptúníọ̀m tabi Neptunium je apilese kemika pelu ami-idamo Np ati nomba atomu 93.


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  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.