Platinum

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Platinum
78Pt
Pd

Pt

Ds
iridiumplatinumgold
Ìhànsójú
grayish white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà platinum, Pt, 78
Ẹ̀ka ẹ́límẹ̀nti transition metal
Ẹgbẹ́, àsìkò, àdìpò 106, d
Ìwúwo átọ́mù 195.084
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f14 5d9 6s1
2, 8, 18, 32, 17, 1
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 469 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
Platinum 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
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù platinum
iso NA half-life DM DE (MeV) DP
190Pt 0.014% 6.5×1011 y α 3.18 186Os
191Pt syn 2.76 d ε  ? 191Ir
192Pt 0.782% 192Pt is stable with 114 neutrons
193Pt syn 50 y ε  ? 193Ir
193mPt syn 4.33 d IT 0.1355e 193Pt
194Pt 32.967% 194Pt is stable with 116 neutrons
195Pt 33.832% 195Pt is stable with 117 neutrons
195mPt syn 4.02 d IT 0.1297e 195Pt
196Pt 25.242% 196Pt is stable with 118 neutrons
197Pt syn 19.8913 h β 0.719 197Au
197mPt syn 1.59 h IT 0.3465 197Pt
198Pt 7.163% 198Pt is stable with 120 neutrons
· r


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