Is technetium a metal?

Yes. Technetium is a metal, classified as a transition metal on the periodic table.

How many protons does technetium have?

Technetium has 43 protons. Its atomic number is 43, which is also the number of electrons in a neutral atom of technetium.

What group and period is technetium in?

Technetium is in group 7 and period 5 of the periodic table, in the d-block.

What is the atomic mass of technetium?

The atomic mass of technetium is 98 u (unified atomic mass units).

Element 43

Technetium (Tc)

Transition metal · Period 5 · Group 7 · d-block

Technetium (Tc) is element 43 of the periodic table, a transition metal in period 5, group 7 (d-block) with an atomic mass of 98 and is a solid at standard conditions.

At a glance

Atomic number: 43
Symbol: Tc
Atomic mass: 98 u
Category: Transition metals
Period: 5
Group: 7
Block: d-block
Phase at STP: solid

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2
Shorthand configuration: [Kr] 4d5 5s2
Electrons per shell: 2, 8, 18, 13, 2
Oxidation states: -3, -1, +1, +2, +3, +4, +5, +6, +7

Physical properties

Melting point: 2,430 K (2,156.85 °C)
Boiling point: 4,538 K (4,264.85 °C)
Density: 11.5 g/cm³
Phase: solid

Atomic properties

Electronegativity (Pauling): 1.9
Atomic radius: 183 pm
Covalent radius: 147 pm
First ionization energy: 702 kJ/mol
Electron affinity: 53 kJ/mol

Notable isotopes

Notable isotopes of Technetium: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Tc-98	97.90722	-	Half-life 4.2 million years

Common uses

Medical imaging
Nuclear medicine
Calibration sources

Discovery

Year: 1937
Discovered by: Carlo Perrier, Emilio Segrè
Country: Italy

Frequently asked questions

Is technetium a metal?: Yes. Technetium is a metal, classified as a transition metal on the periodic table.
How many protons does technetium have?: Technetium has 43 protons. Its atomic number is 43, which is also the number of electrons in a neutral atom of technetium.
What group and period is technetium in?: Technetium is in group 7 and period 5 of the periodic table, in the d-block.
What is the atomic mass of technetium?: The atomic mass of technetium is 98 u (unified atomic mass units).

Keep exploring

Technetium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.