
Technetium (Tc) is a chemical element of the periodic table, located in the group 7 and the period 5, and has the atomic number 43. It is a rare, silvery-grey transition metal, whose name comes from the Greek word “technetos”, which means artificial. It is counted as one of the radioactive elements.
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– d block |
FAQs on Technetium Element
Technetium |
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‣ What does technetium look like? Appearance: shiny gray metal |
‣ Who discovered technetium and in what year? Prediction: Dmitri Mendeleev (1871) Discovery and first isolation: Emilio Sergre and Carlo Perrier (1937) |
‣ Where is technetium found on the periodic table?![]() Location: Technetium is found in the seventh column of the periodic table, next to the molybdenum element. |
‣ What is the atomic number of technetium? Atomic number (Z): 43 |
‣ What is technetium’s symbol? Symbol: Tc |
‣ What is the atomic weight of technetium? Standard atomic weight: [97] |
‣ Which block does technetium belong to? Block: d-block |
‣ What group is technetium in on the periodic table? Group: 7 |
‣ What period is technetium on the periodic table? Period: 5 |
‣ Technetium atomic radius: empirical: 136 pm |
‣ Technetium covalent radius: 147±7 pm |
‣ What is the melting point of technetium? Melting point: 2430 K (2157 °C, 3915 °F) |
‣ What is technetium boiling point? Boiling point: 4538 K (4265 °C, 7709 °F) |
‣ How many electron shells does technetium have? Electrons per shell: 2, 8, 18, 13, 2 |
‣ What is the electron configuration of technetium? Electron configuration: [Kr] 4d5 5s2 |
‣ Technetium ionization energies: 1st: 702 kJ/mol 2nd: 1470 kJ/mol 3rd: 2850 kJ/mol |
‣ What is the phase of technetium? Phase (at r.t): solid |
‣ What is the density of the element technetium? Density (near r.t): 11 g/cm3 |
‣ Technetium magnetic ordering: paramagnetic |
‣ Technetium natural occurrence: from decay |
‣ Technetium oxidation state: +4, +6, +7 |
‣ Technetium electronegativity: Pauling scale: 1.9 |
‣ Technetium heat of fusion: 33.29 kJ/mol |
‣ Technetium heat of vaporization: 585.2 kJ/mol |
‣ Technetium molar heat capacity: 24.27 J/(mol K) |
‣ Technetium molar magnetic susceptibility: +270.0 × 10-6 cm3/mol (298 K) |
‣ Speed of sound in technetium: 16,200 m/s (at 20 °C) |
‣ What is the crystal structure of technetium? Crystal structure: hexagonal close-packed (hcp) |
‣ Thermal expansion of technetium: 7.1 µm/(m.K) (at r.t) |
‣ Thermal conductivity of technetium: 50.6 W/(m.K) |
‣ Technetium electrical resistivity: 200 nΩ.m (at 20 °C) |
‣ Technetium CAS number: 7440-26-8 |
‣ Technetium vapor pressure
Vapor pressure (extrapolated) | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 2727 | 2998 | 3324 | 3726 | 4234 | 4894 |
‣ How many isotopes does technetium have?
Main isotopes of technetium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
95Tc | syn | 61 d | ε γ IT | 95Mo – 95Tc |
96Tc | syn | 4.3 d | ε γ | 96Mo – |
97Tc | syn | 4.21 × 106 y | ε | 97Mo |
97Tc | syn | 91 d | IT | 97Tc |
98Tc | syn | 4.2 × 106 y | β– γ | 98Ru – |
99Tc | trace | 2.111 × 105 y | β– | 99Ru |
95Tc | syn | 6.01 h | IT γ | 99Tc – |
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