Periodic Table of Elements
Element Technetium - Tc
Comprehensive data on the chemical element Technetium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Technetium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.
Technetium Menu
- Technetium Page One
- Technetium Page Two
Overview of Technetium
- Atomic Number: 43
- Group: 7
- Period: 5
- Series: Transition Metals
Technetium's Name in Other Languages
- Latin: Technetium
- Czech: Technecium
- Croatian: Tehnecij
- French: Technetium
- German: Technetium - s
- Italian: Tecneto
- Norwegian: Technetium
- Portuguese: Tecnécio
- Russian: Технеций
- Spanish: Tecnecio
- Swedish: Teknetium
Atomic Structure of Technetium
- Atomic Radius: 1.95Å
- Atomic Volume: 8.5cm3/mol
- Covalent Radius: 1.27Å
- Cross Section (Thermal Neutron Capture) σa/barns: 20
- Crystal Structure: Hexagonal
- Electron Configuration:
- 1s2 2s2p6 3s2p6d10 4s2p6d5 5s2
- Electrons per Energy Level: 2,8,18,13,2
- Ionic Radius: 0.56Å
- Filling Orbital: 4d6
- Number of Electrons (with no charge): 43
- Number of Neutrons (most common/stable nuclide): 55
- Number of Protons: 43
- Oxidation States: 7
- Valence Electrons: 4d6 5s1
- Electron Dot Model
- Electron Dot Model
Chemical Properties of Technetium
- Electrochemical Equivalent: 0.51651g/amp-hr
- Electron Work Function:
- Electronegativity: 1.9 (Pauling); 1.36 (Allrod Rochow)
- Heat of Fusion: 24kJ/mol
- Incompatibilities:
- Ionization Potential
- Valence Electron Potential (-eV): 180
Physical Properties of Technetium
- Atomic Mass Average: 98
- Boiling Point: 5150K 4877°C 8811°F
- Coefficient of lineal thermal expansion/K-1: 8.06E-6
- Conductivity
- Electrical: 0.067 106/cm Ω
Thermal: 0.506 W/cmK
- Electrical: 0.067 106/cm Ω
- Density: 11.5g/cc @ 300K
- Description:
- First artificially created element.
- Enthalpy of Atomization: 649 kJ/mole @ 25°C
- Enthalpy of Fusion: 23.01 kJ/mole
- Enthalpy of Vaporization: 660 kJ/mole
- Flammablity Class:
- Freezing Point: see melting point
- Heat of Vaporization: 660kJ/mol
- Melting Point: 2473K 2200°C 3992°F
- Molar Volume: 8.51 cm3/mole
- Physical State (at 20°C & 1atm): Solid
- Specific Heat: 0.21J/gK
- Vapor Pressure = 0.0229Pa@2200°C
Regulatory / Health
- CAS Number
- 7440-26-8
- NFPA 704
- Health:
- Fire:
- Reactivity:
- Special Hazard: Radioactive<
- OSHA Permissible Exposure Limit (PEL)
- No limits set by OSHA
- OSHA PEL Vacated 1989
- No limits set by OSHA
- NIOSH Recommended Exposure Limit (REL)
- No limits set by NIOSH
- Levels In Humans:
Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.- Blood/mg dm-3: nil
- Bone/p.p.m: nil
- Liver/p.p.m: nil
- Muscle/p.p.m: nil
- Daily Dietary Intake: nil
- Total Mass In Avg. 70kg human: nil
Who / Where / When / How
- Discoverer: Carlo Perrier, Emillo G. Segre
- Discovery Location: Palermo Italy (Sicily)
- Discovery Year: 1937
- Name Origin:
- Greek: technêtos (artificial).
- Abundance of Technetium:
- Earth's Crust/p.p.m.: N/A
- Seawater/p.p.m.: nil
- Atmosphere/p.p.m.: N/A
- Sun (Relative to H=1E12): N/A
- Sources of Technetium:
- Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron. Produced in kilogram quantities.
- Uses of Technetium:
- Radiation source for medical research.
- Additional Notes:
- Technetium has never been found on Earth dispite extensive searches. It has, however, been detected in the spectra of stars other than the sun.
Technetium Menu
- Technetium Page One
- Technetium Page Two
References
A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.
Related Resources
- Anatomy of the Atom
Answers many questions regarding the structure of atoms. - Molarity, Molality and Normality
Introduces stoichiometry and explains the differences between molarity, molality and normality. - Molar Mass Calculations and Javascript Calculator
Molar mass calculations are explained and there is a JavaScript calculator to aid calculations. - Chemical Database
This database focuses on the most common chemical compounds used in the home and industry.
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