هافنيوم

Hafnium, ₇₂Hf
	Spectral lines of hafnium (400–700 nm)
عمومي خواص
Pronunciation	/ˈhæfniəm/ ; HAF-nee-əm
Appearance	steel gray
Hafnium په دوراني جدول کې
lutetium ← hafnium → tantalum	‍
اټومي شمیره (Z)	72
گروپ, پیریود	group 4, period 6
بلاک	d-block
Element category	transition metal
معياري اټومي وزن (Ar)	کينډۍ:Val
Electron configuration	[Xe] 4f14 5d2 6s2
Electrons per shell	2, 8, 18, 32, 10, 2
فزیکي خواص
حالت (at STP)	جامد
دويلې کيدو ټکى	2506 K (2233 °C, 4051 °F)
يشنا ټکی	4876 K (4603 °C, 8317 °F)
Density near r.t.	13.31 g/cm3
when liquid, at m.p.	12 g/cm3
Heat of fusion	27.2 kJ/mol
Heat of vaporization	648 kJ/mol
Molar heat capacity	25.73 J/(mol·K)
اټومي خواص
Oxidation states	4, 3, 2, 1, −2 (an amphoteric oxide)
Electronegativity	Pauling scale: 1.3
Ionization energies	1st: 658.5 kJ/mol ; 2nd: 1440 kJ/mol ; 3rd: 2250 kJ/mol ; ;
Atomic radius	empirical: 159 pm
Covalent radius	175±10 pm
Miscellanea
Crystal structure	hexagonal close-packed (hcp) Hexagonal close packed crystal structure for hafnium
Speed of sound thin rod	3010 m/s (at 20 °C)
Thermal expansion	5.9 µm/(m·K) (at 25 °C)
د تودوخې تېرېدنه	23.0 W/(m·K)
Electrical resistivity	331 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Magnetic susceptibility (χmol)	+75.0·10−6 cm3/mol (at 298 K)
Young's modulus	78 GPa
Shear modulus	30 GPa
Bulk modulus	110 GPa
Poisson ratio	0.37
Mohs hardness	5.5
Vickers hardness	1520–2060 MPa
Brinell hardness	1450–2100 MPa
CAS Number	7440-58-6
History
Naming	after Hafnia. Latin for: Copenhagen, where it was discovered
Prediction	Dmitri Mendeleev (1869)
Discovery and first isolation	Dirk Coster and George de Hevesy (1922)
Main isotopes of hafnium
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هافنيوم (په انگرېزي: Hafnium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Hf سمبول او v۲ اتمي شمېرې په وسیله ښودل شوی دی.

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سرچينې

↑ Meija, J.; Coplen, T. B. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure Appl. Chem. 88 (3): 265–91. doi:10.1515/pac-2015-0305. {{cite journal}}: Unknown parameter |displayauthors= ignored (|display-authors= suggested) (help)
↑ Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

دا ليکنه نابشپړه ده، تاسې ددې ليکنې په بشپړولو کې د ويکيپېډيا سره مرسته کولای شئ.

[CIAAW2016-1] Meija, J.; Coplen, T. B. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure Appl. Chem. 88 (3): 265–91. doi:10.1515/pac-2015-0305. {{cite journal}}: Unknown parameter |displayauthors= ignored (|display-authors= suggested) (help)

[magnet-2] Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.

[3] Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

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