Platinum

Platinum
78Pt
Pd ↑ Pt ↓ Ds Tábìlì ìdásìkò iridium ← platinum → gold
Ìhànsójú
grayish white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	platinum, Pt, 78
Ẹ̀ka ẹ́límẹ̀nti	transition metal
Ẹgbẹ́, àsìkò, àdìpò	10, 6, 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
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