Technetium (Tc) – Periodic Table [Element Information & More]

technetium element periodic table

Technetium element (Tc) is in group 7 and period 5 of a periodic table. Technetium is in the d-block and it is classified as a transition element on the periodic table.

There is a lot more information related to technetium which is mentioned in the Information Table given below.

So let’s dive right into it!

Table of contents

Technetium Element (Information Table)

The important data related to technetium element is given in the table below.

Appearance of technetiumSilvery gray metallic appearance
Atomic number of technetium43
Symbol of technetiumTc
Atomic mass of technetium (most stable isotope)98 u
Protons, Neutrons & Electrons in technetiumProtons: 43, Neutrons: 55, Electrons: 43
State of technetium (at STP)Solid
Group number of technetium in periodic table7
Period number of technetium in periodic table5
Block of technetium in periodic tabled-block
Category of technetiumTransition metal
Bohr model or Electrons per shell or Electrons arrangement in technetium2, 8, 18, 13, 2
Electron configuration of technetium[Kr] 4d5 5s2
Orbital diagram of technetiumorbital diagram of technetium
Electronegativity of technetium (on pauling scale)1.9
Atomic radius of technetium (van der Waals radius)209 picometers
Density of technetium11.5 g/cm3
1st ionization energy of technetium7.28 eV
Melting point of technetium2430 K or 2157 °C or 3915 °F
Boiling point of technetium4538 K or 4265 °C or 7709 °F
Crystal structure of technetiumHexagonal Close Packing (HCP)
Discovery of technetiumBy Carlo Perrier and Emilio Segrè in 1973

Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).

Technetium element in Periodic table

The Technetium element (Tc) has the atomic number 43 and is located in group 7 and period 5. Technetium is a metal and it is classified as a transition element.

Click on above elements in the periodic table to see their information.

Facts about technetium

Here are a few interesting facts about technetium element.

  1. The name “Technetium” came from the Greek word “technetos”, which means artificial.
  2. In the beginning, the name of the element was masurium, but later on it was named technetium.
  3. Technetium is very rare and it is believed to be present in different types of stars.
  4. Technetium is an artificial element that is prepared by humans in a laboratory.
  5. Technetium is the 1st laboratory made element on the periodic table.

Properties of technetium

Here is a list of some physical properties and chemical properties of technetium.

Physical properties of technetium

  • Technetium has a silvery gray metallic appearance.
  • The most stable isotope of technetium has an atomic mass of 98 u and its density is 11.5 g/cm3.
  • The melting point and boiling point of technetium is 2430 K and 4538 K respectively.
  • Technetium has a HCP crystal structure.

Chemical properties of technetium

  • The electron configuration of technetium is [Kr] 4d5 5s2, and it has incomplete d-orbitals.
  • Technetium is not soluble in HCl, but is soluble in HNO3 as well as concentrated H2SO4.
  • The common oxidation states of technetium are +7, +5 and +4.
  • Technetium is an artificially made element and it has some isotopes whose half-life is only a few hours and some isotopes have a half-life of 200,000 years to over a million years.

Uses of technetium

Here are some uses of the technetium element.

  • Technetium can be used as a superconductor at the temperature below 11 K.
  • Small amount of technetium is also added to steel manufacturing, which helps steel from corrosion.
  • The isotope of technetium (i.e 99Tc) is used in medical radioactive isotope tests.

External resources:

  1. Technetium – Element information, properties and uses | Periodic Table. (n.d.). Technetium – Element Information, Properties and Uses | Periodic Table.
  2. It’s Elemental – The Element Technetium. (n.d.). It’s Elemental – the Element Technetium.
  3. Armstrong, J. T. (2008, October 16). Technetium: The Element That Was Discovered Twice. NIST.
  4. Radionuclide Basics: Technetium-99 | US EPA. (2015, April 14). US EPA.
  5. Hackney, J. C. (1951, April). Technetium—Element 43. Journal of Chemical Education, 28(4), 186.
  7. Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory.
  8. Technetium | Tc | ChemSpider. (n.d.). Technetium | Tc | ChemSpider.
  9. Prohaska, T., et al. (2022, May 1). Standard atomic weights of the elements 2021 (IUPAC Technical Report). Pure and Applied Chemistry, 94(5), 573–600.
  10. Haynes, W. M. (Ed.). (2014, June 4). CRC Handbook of Chemistry and Physics.
  11. Kaye, G W.C., & Laby, T H. Tables of physical and chemical constants. 15th Edition. United States.
  12. Sansonetti, J. E., & Martin, W. C. (2005, December). Handbook of Basic Atomic Spectroscopic Data. Journal of Physical and Chemical Reference Data, 34(4), 1559–2259.
  13. Bondi, A. (1964, March). van der Waals Volumes and Radii. The Journal of Physical Chemistry, 68(3), 441–451.
  14. Holden, et al. (2018, December 1). IUPAC Periodic Table of the Elements and Isotopes (IPTEI) for the Education Community (IUPAC Technical Report). Pure and Applied Chemistry, 90(12), 1833–2092.
  15. Zhang, et al. (2011, January 11). Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in Handbooks. Journal of Chemical & Engineering Data, 56(2), 328–337.

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