Chemicool

Re

75

186.207
Rhenium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Rhenium Symbol Re
atomic number 75 Atomic weight 186.207
Density @ 293 K 21.0 g/cm3 Atomic volume 8.85 cm3/mol
Group Trans. Met. discovered 1925

States
state (s, l, g) s
melting point 3453.2 K boiling point 5923 K
Heat of fusion 33.20 kJ/mol Heat of vaporization 715.0 kJ/mol
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Energies
1st ionization energy 760 kJ/mole electronegativity 1.9
2nd ionization energy kJ/mole electron affinity 14 kJ/mole
3rd ionization energy kJ/mole Specific heat 0.13 J/gK
heat atomization 770 kJ/mole atoms

Oxidation & Electrons
Shells 2,8,18,32,13,2 electron configuration [Xe] 4f14 5d5 6s2
minimum oxidation number -3 maximum oxidation number 7
min. common oxidation no. 0 max. common oxidation no. 4
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Appearance & Characteristics
structure hcp: hexagonal close pkd color silvery-white
uses catalysts, thermocouples toxicity
hardness mohs characteristics high melting point

Reactions
reaction with air mild, w/ht = Re2O7 reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 mild, = HReO4
reaction with 6M NaOH
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Other Forms
number of isotopes 2 hydride(s) none
oxide(s) Re2O5 ReO3 Re2O7 chloride(s) Re3Cl9 ReCl4 ReCl5 ReCl6

Radius
ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 137 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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Conductivity
thermal conductivity 48 J/m-sec-deg electrical conductivity 51.813 1/mohm-cm
polarizability 9.7 A^3

Abundance
source Molybdenite (sulfide) rel. abund. solar system -1.287 log
abundance earth's crust -2.3 log cost, pure 540 $/100g
cost, bulk $/100g
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