platinum

platinum (chemical element)

€771.79 per troy ounce

Periodic table location

Image

atomic symbol | Pt atomic number | 78 short electronic configuration | [Xe]6s^14f^145d^9 Aufbau diagram | 5d 4f 6s block | d group | 10 period | 6 atomic mass | 195.084 u (unified atomic mass units)

phase at STP | solid melting point | 1768.3 °C (rank: 17th) boiling point | 3825 °C (rank: 18th) molar heat of fusion | 20 kJ/mol (rank: 21st) molar heat of vaporization | 490 kJ/mol (rank: 16th) specific heat at STP | 133 J/(kg K) (rank: 74th) (properties at standard conditions)

density | 21.45 g/cm^3 (rank: 3rd) liquid density | 19.77 g/cm^3 molar volume | 9.095 cm^3/mol Mohs hardness | 3.5 (between calcite and fluorite) Vickers hardness | 549 MPa (rank: 28th) Brinell hardness | 392 MPa (rank: 38th) bulk modulus | 230 GPa (rank: 6th) shear modulus | 61 GPa Young's modulus | 168 GPa (rank: 15th) Poisson ratio | 0.38 (rank: 6th) sound speed | 2680 m/s (rank: 39th) thermal expansion | 8.8×10^-6 K^(-1) (rank: 44th) thermal conductivity | 72 W/(m K) (rank: 26th) (properties at standard conditions)

electrical type | conductor resistivity | 1.1×10^-7 Ω m (ohm meters) electrical conductivity | 9.4×10^6 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 2.573×10^-4 mass magnetic susceptibility | 1.22×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.38×10^-9 m^3/mol (cubic meters per mole) work function | (5.12 to 5.93) eV threshold frequency | (1.238×10^15 to 1.434×10^15) Hz (hertz) color | (gray) (work function range from 5 different crystalline orientations)

valence | 6 electronegativity | 2.28 electron affinity | 205.3 kJ/mol (kilojoules per mole) first ionization energy | 870 kJ/mol (kilojoules per mole) ionization energies | 870 kJ/mol | 1791 kJ/mol

Reactivity

term symbol | ^3D_3 atomic radius | 135 pm covalent radius | 136 pm van der Waals radius | 175 pm (electronic ground state properties)

(neutral platinum atomic spectrum)

universe abundance | 5×10^-7 mass% (rank: 45th) solar abundance | 9×10^-7 mass% (rank: 38th) meteorite abundance | 9.8×10^-5 mass% (rank: 41st) crust abundance | 3.7×10^-6 mass% (rank: 70th) universe molar abundance | 3×10^-9 mol% (rank: 51st) solar molar abundance | 6×10^-9 mol% (rank: 43rd) meteorite molar abundance | 1×10^-5 mol% (rank: 43rd) crust molar abundance | 4×10^-7 mol% (rank: 72nd)

half-life | (stable) stable isotopes | Pt-195 (33.832%) | Pt-194 (32.967%) | Pt-196 (25.242%) | Pt-198 (7.163%) | Pt-192 (0.782%) nuclear spin | Pt-166: 0^+ | Pt-167: 7/2^- | Pt-168: 0^+ | Pt-169: 7/2^- | Pt-170: 0^+ | Pt-171: 3/2^- | Pt-172: 0^+ | Pt-173: 5/2^- | Pt-174: 0^+ | Pt-175: 7/2^- | Pt-176: 0^+ | Pt-177: 5/2^- | Pt-178: 0^+ | Pt-179: 1/2^- | Pt-180: 0^+ | Pt-181: 1/2^- | Pt-182: 0^+ | Pt-183: 1/2^- | Pt-184: 0^+ | Pt-185: 9/2^+ | Pt-186: 0^+ | Pt-187: 3/2^- | Pt-188: 0^+ | Pt-189: 3/2^- | Pt-190: 0^+ | Pt-191: 3/2^- | Pt-192: 0^+ | Pt-193: 1/2^- | Pt-194: 0^+ | Pt-195: 1/2^- | Pt-196: 0^+ | Pt-197: 1/2^- | Pt-198: 0^+ | Pt-199: 5/2^- | Pt-200: 0^+ | Pt-201: 5/2^- | Pt-202: 0^+ unstable isotopes | Pt-190 (650 billion yr) | Pt-193 (51 yr) | Pt-188 (10.2 days) | Pt-191 (67.9 h) | Pt-202 (44 h) | Pt-197 (19.8915 h) | Pt-200 (12 h) | Pt-189 (10.869 h) | Pt-187 (141 min) | Pt-186 (124.8 min) | Pt-185 (70.83 min) | Pt-199 (30.8 min) | Pt-184 (17.33 min) | Pt-183 (6.5 min) | Pt-182 (180 s) | Pt-201 (150 s) | Pt-180 (56 s) | Pt-181 (52 s) | Pt-179 (21.2 s) | Pt-178 (21.1 s) | Pt-177 (10.6 s) | Pt-176 (6.33 s) | Pt-175 (2.53 s) | Pt-174 (889 ms) | Pt-173 (382 ms) | Pt-172 (96 ms) | Pt-171 (51 ms) | Pt-170 (13.8 ms) | Pt-169 (7 ms) | Pt-168 (2.1 ms) | Pt-167 (900 µs) | Pt-166 (300 µs) neutron cross-section | 10 b neutron mass absorption | 0.002 m^2/kg

CAS number | 7440-06-4 PubChem CID number | 23939