Chemicool

Pt

78

195.09
Platinum
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Platinum Symbol Pt
atomic number 78 Atomic weight 195.09
Density @ 293 K 21.45 g/cm3 Atomic volume 9.10 cm3/mol
Group Trans. Met. discovered 1748

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

Reactions
reaction with air none reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 none
reaction with 6M NaOH none
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Other Forms
number of isotopes 6 hydride(s) none
oxide(s) PtO2 chloride(s) PtCl2 PtCl4

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

Abundance
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
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