نېپټونيوم

Neptunium, ₉₃Np
عمومي خواص
Pronunciation	UK /nɛpˈtjuːniəm/, US /nɛpˈtuːniəm/ ; nep-TEW-nee-əm, nep-TOO-nee-əm
Appearance	silvery metallic
Neptunium په دوراني جدول کې
uranium ← neptunium → plutonium	‍
اټومي شمیره (Z)	93
گروپ, پیریود	group n/a, period 7
بلاک	f-block
Element category	actinide
Mass number	237 (most stable isotope)
Electron configuration	[Rn] 5f4 6d1 7s2
Electrons per shell	2, 8, 18, 32, 22, 9, 2
فزیکي خواص
حالت (at STP)	جامد
دويلې کيدو ټکى	912±3 K (639±3 °C, 1182±5 °F)
يشنا ټکی	4447 K (4174 °C, 7545 °F) (extrapolated)
Density near r.t.	alpha: 20.45 g/cm3 ; accepted standard value: 19.38 g/cm3
Heat of fusion	5.19 kJ/mol
Heat of vaporization	336 kJ/mol
Molar heat capacity	29.46 J/(mol·K)
اټومي خواص
Oxidation states	7, 6, 5, 4, 3, 2 (an amphoteric oxide)
Electronegativity	Pauling scale: 1.36
Ionization energies	1st: 604.5 kJ/mol ; ;
Atomic radius	empirical: 155 pm
Covalent radius	190±1 pm
Miscellanea
Crystal structure	orthorhombic Orthorhombic crystal structure for neptunium
د تودوخې تېرېدنه	6.3 W/(m·K)
Electrical resistivity	1.220 µΩ·m (at 22 °C)
Magnetic ordering	paramagnetic
CAS Number	7439-99-8
History
Naming	after planet Neptune, itself named after Roman god of the sea Neptune
Discovery	Edwin McMillan and Philip H. Abelson (1940)
Main isotopes of neptunium
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نېپټونيوم (په انگرېزي: Neptunium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Np سمبول او ۹۳ اتمي شمېرې په وسیله ښودل شوی دی.

مشخصات

↑ Sanchez, Rene G.; Loaiza, David J.; Kimpland, Robert H.; Hayes, David K.; Cappiello, Charlene C.; Myers, William L.; Jaegers, Peter J.; Clement, Steven D.; Butterfield, Kenneth B. "Criticality of a ²³⁷Np Sphere" (PDF). Japanese Atomic Energy Agency. نه اخيستل شوی 2014-08-06.
↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

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