ChemiPlus Logo
Dictionary - Training


 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance


Name: Platinum Symbol: Pt
Group: Trans. Met. Atomic weight: 195.09
Density @ 293 K: 21.45 g/cm3 Atomic volume: 9.10 cm3/mol
Group: Trans. Met. discovered: 1748


state (s, l, g): s
melting point: 2045.2 K boiling point: 4443 K
Heat of fusion: 19.60 kJ/mol Heat of vaporization: 510.0 kJ/mol


1st ionization energy: 870 kJ/mole
electronegativity: 2.28 2nd ionization energy: 1791 kJ/mole
electron affinity: 205.3 kJ/mole 3rd ionization energy: kJ/mole
Specific heat: 0.13 J/gK heat atomization: 565 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,32,17,1 electron configuration: [Xe] 4f14 5d9 6s1
minimum oxidation number: 0 maximum oxidation number: 6
min. common oxidation no.: 0 max. common oxidation no.: 4

Appearance & Characteristics:

structure: fcc: face-centered cubic color: silvery-white
uses: jewelry, catalysts toxicity:
hardness: 4.3 mohs characteristics: Inert, ductile


reaction with air: none
reaction with 6M HCl: none reaction with 6M HCl: none
reaction with 15M HNO3: none reaction with 6M NaOH: none

Other Forms:

number of isotopes: 6 hydride(s): none
oxide(s): PtO2 chloride(s): PtCl2 PtCl4


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 139 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): 94 pm ionic radius (3+ ion): pm


thermal conductivity: 71.6 J/m-sec-deg
electrical conductivity: 94.34 1/mohm-cm polarizability: 6.5 A^3


source: nickel ores (sulfides)
rel. abund. solar system: 0.127 log abundance earth's crust: -2.3 log
cost, pure: 4700 $/100g cost, bulk: 1200 $/100g