Chemicool

Tc

43

98.9062
Technetium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Technetium Symbol Tc
atomic number 43 Atomic weight 98.9062
Density @ 293 K 11.5 g/cm3 Atomic volume 8.5 cm3/mol
Group Trans. Met. discovered 1939

States
state (s, l, g) s
melting point 2445.2 K boiling point 4840 K
Heat of fusion 24.0 kJ/mol Heat of vaporization 660.0 kJ/mol
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Energies
1st ionization energy 702.4 kJ/mole electronegativity 1.9
2nd ionization energy 1472.4 kJ/mole electron affinity 53 kJ/mole
3rd ionization energy 2850.2 kJ/mole Specific heat 0.21 J/gK
heat atomization 677 kJ/mole atoms

Oxidation & Electrons
Shells 2,8,18,14,1 electron configuration [Kr] 4d5 5s2
minimum oxidation number -3 maximum oxidation number 7
min. common oxidation no. 0 max. common oxidation no. 7
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Appearance & Characteristics
structure hcp: hexagonal close pkd color silvery gray
uses medical imaging agents toxicity
hardness mohs characteristics Radioactive, man made

Reactions
reaction with air mild, w/ht, = Tc2O7 reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 mild, = HTcO4
reaction with 6M NaOH
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Other Forms
number of isotopes 0 hydride(s) none
oxide(s) TcO2 Tc2O7 chloride(s) TcCl4

Radius
ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 136 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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Conductivity
thermal conductivity 50.6 J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 11.4 A^3

Abundance
source Synthetic (U fission) rel. abund. solar system log
abundance earth's crust log cost, pure $/100g
cost, bulk $/100g
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