| colspan=2 style="text-align: center" | Main article: Isotopes of प्वलाख
| प्वलाख
|
78Pt
|
|
|
| रुप
|
grayish white
|
| साधारण गुण
|
| नां, चिं, ल्या
|
प्वलाख, Pt, 78
|
| उच्चारण
|
/ˈplætɨnəm/
|
| धातुया वर्ग
|
transition metal
|
| ग्रुप, पिरियद, ब्लक
|
10, 6, 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
|
| 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
|
| 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
|
| (β−β−)
|
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।
