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Technetium

43
Tc
98.9062
Technetium
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Technetium Symbol: Tc
Group: Trans. Met. 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

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

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:

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

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