प्वलाख

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प्वलाख
78Pt
Pd

Pt

Ds
इरिडियमप्वलाखलुं
रुप
grayish white
साधारण गुण
नां, चिं, ल्या प्वलाख, Pt, 78
उच्चारण /ˈplætɨnəm/
धातुया वर्ग transition metal
ग्रुप, पिरियद, ब्लक 106, d
Standard atomic weight 195.084
Electron configuration [Xe] 4f14 5d9 6s1
2, 8, 18, 32, 17, 1
History
Discovery Antonio de Ulloa (1735)
First isolation Antonio de Ulloa (1735)
Physical properties
Phase solid
Density (near r.t.) 21.45 g·cm−3
Liquid density at m.p. 19.77 g·cm−3
Melting point 2041.4 K, 1768.3 °C, 3214.9 °F
Boiling point 4098 K, 3825 °C, 6917 °F
Heat of fusion 22.17 kJ·mol−1
Heat of vaporization 510 kJ·mol−1
Molar heat capacity 25.86 J·mol−1·K−1
Vapor 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 6, 5, 4, 3, 2, 1, −1, −2
(mildly basic oxide)
Electronegativity 2.28 (Pauling scale)
Ionization energies 1st: 870 kJ·mol−1
2nd: 1791 kJ·mol−1
Atomic radius 139 pm
Covalent radius 136±5 pm
Van der Waals radius 175 pm
Miscellanea
Crystal structure face-centered cubic
प्वलाख has a face-centered cubic crystal structure
Magnetic ordering paramagnetic
Electrical resistivity (20 °C) 105 nΩ·m
Thermal conductivity 71.6 W·m−1·K−1
Thermal expansion (25 °C) 8.8 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) 2800 m·s−1
Tensile strength 125-240 MPa
Young's modulus 168 GPa
Shear modulus 61 GPa
Bulk modulus 230 GPa
Poisson ratio 0.38
Mohs hardness 4–4.5
Vickers hardness 549 MPa
Brinell hardness 392 MPa
CAS registry number 7440-06-4
Most stable isotopes
Main article: Isotopes of प्वलाख
iso NA half-life DM DE (MeV) DP
190Pt 0.014% 6.5×1011 y α 3.252 186Os
192Pt 0.782% >4.7×1016 y (α) 2.4181 188Os
193Pt syn 50 y ε - 193Ir
194Pt 32.967% - (α) 1.5045 190Os
195Pt 33.832% - (α) 1.1581 191Os
196Pt 25.242% - (α) 0.7942 192Os
198Pt 7.163% >3.2×1014 y (α) 0.0870 194Os
(ββ) 1.0472 198Hg
Decay modes in parentheses are predicted, but have not yet been observed
· r

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

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