Nẹ́ptúníọ̀m

Neptunium
93Np
Pm ↑ Np ↓ (Uqt) Tábìlì ìdásìkò uranium ← neptunium → plutonium
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/a, 7, 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 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
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

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