Neptunyo

Neptunium
93Np
Pm ↑ Np ↓ (Uqp) Periodic table uranium ← neptunium → plutonium
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
History
Discovery	Edwin McMillan and Philip H. Abelson (1940)
Physical properties
Phase	magahi
Density (near r.t.)	20.45 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
Magnetic ordering	paramagnetic
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

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.

Galeriya sa hulagway

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