प्वलाख

Platinum being dissolved in hot aqua regia

A native platinum nugget, Kondyor

Platinum-palladium ore, Stillwater mine, Beartooth Mountains, Montana, US

प्वलाख, ₀₀Pt

प्वलाख
Pronunciation	/ˈplætənəm/ ​(plat-ƏN-əm)
Appearance	grayish white
Standard atomic weight Ar°(Pt)
	195.084±0.009 195.08±0.02 (abridged)
प्वलाख in the periodic table
Pd ↑ Pt ↓ Ds इरिडियम ← प्वलाख → लुं
Group	group 10
Period	period 6
Block	d-block
Electron configuration	[Xe] 4f14 5d9 6s1
Electrons per shell	2, 8, 18, 32, 17, 1
Physical properties
Phase at STP	solid
Melting point	2041.4 K ​(1768.3 °C, ​3214.9 °F)
Boiling point	4098 K ​(3825 °C, ​6917 °F)
Density (near r.t.)	21.45 g/cm3
when liquid (at m.p.)	19.77 g/cm3
Heat of fusion	22.17 kJ/mol
Heat of	510 kJ/mol
Molar heat capacity	25.86 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2330 (2550) 2815 3143 3556 4094
Atomic properties
Oxidation states	साधारण: +2, +4 −3,? −2,? −1,? 0,? +1,? +3,? +5, +6
Electronegativity	Pauling scale: 2.28
Atomic radius	empirical: 139 pm
Covalent radius	136±5 pm
Van der Waals radius	175 pm
Color lines in a spectral range Spectral lines of प्वलाख
Other properties
Natural occurrence	primordial
Crystal structure	​(fcc)
Thermal expansion	8.8 µm/(m⋅K) (at 25 °C)
Thermal conductivity	71.6 W/(m⋅K)
Electrical resistivity	105 n Ω⋅m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	168 GPa
Shear modulus	61 GPa
Bulk modulus	230 GPa
Speed of sound thin rod	2800 m/s (at r.t.)
Poisson ratio	0.38
Mohs hardness	4–4.5
Vickers hardness	549 MPa
Brinell hardness	392 MPa
CAS Number	7440-06-4
History
Discovery	Antonio de Ulloa (1735)
First isolation	Antonio de Ulloa (1735)
Isotopes of प्वलाख

प्वलाख वा Platinum छता रसायनिक तत्त्व ख। थ्व तत्त्वया रसायनिक चिं Pt ख। थ्व तत्त्वया एतमिक ल्या ७८ ख।