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Technetium (Tc) – Element 43 of the periodic table

Technetium (symbol Tc) is element number 43 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 98, and its phase under standard conditions is Solid. This element sits in period 5 and group 7 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 13, 2. The short electron configuration of Technetium is [Kr] 4d⁵ 5s². Known uses of Technetium include Nuclear medicine, Corrosion inhibitor and Scientific research.

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Properties of Technetium

Atomic number
43
Chemical symbol
Tc
Atomic mass
98
Category
Transition metal
Period
5
Group
7
Phase
Solid
Protons
43
Electrons
43
Neutrons (approx.)
55
Electron shells
2, 8, 18, 13, 2
Outer-shell electrons
2
Discovered
Carlo Perrier and Emilio Segrè (1937)

Electron configuration of Technetium

The electron configuration of Technetium (Tc), with 43 electrons, is shown below. The last shell (shell 5) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s²
Short configuration
[Kr] 4d⁵ 5s²
Last shell
5s²

What is electron configuration and how is it written?

Electron shells of Technetium

Distribution of 43 electrons of Technetium across shells K to O:

  1. K2
  2. L8
  3. M18
  4. N13
  5. O2

What is a transition metal?

The transition metals are the d-block elements: usually good conductors of heat and electricity, with several oxidation states, and they form colourful compounds and important catalysts.

Uses of Technetium

Frequently asked questions about Technetium

What is the atomic number of Technetium?

The atomic number of Technetium (Tc) is 43; that is, every atom of it has 43 protons.

What is the electron configuration of Technetium?

The electron configuration of Technetium (Tc) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s²; in short form it is [Kr] 4d⁵ 5s², and its last shell is 5s².

What is the chemical symbol of Technetium?

The chemical symbol of Technetium is Tc.

Where is Technetium located in the periodic table?

Technetium is located in period 5 and group 7 and belongs to the “Transition metal” category.

What is the atomic mass of Technetium?

The atomic mass of Technetium is about 98 (atomic mass units).

What is the phase of Technetium under normal conditions?

The phase of Technetium under standard conditions is Solid.

What are the uses of Technetium?

Uses of Technetium include Nuclear medicine, Corrosion inhibitor and Scientific research.

Who discovered Technetium?

Technetium was discovered by Carlo Perrier and Emilio Segrè in 1937.

Elements in the same category as Technetium (Transition metal)

Scandium (Sc)Titanium (Ti)Vanadium (V)Chromium (Cr)Manganese (Mn)Iron (Fe)Cobalt (Co)Nickel (Ni)Copper (Cu)Zinc (Zn)Yttrium (Y)Zirconium (Zr)Niobium (Nb)Molybdenum (Mo)Ruthenium (Ru)Rhodium (Rh)Palladium (Pd)Silver (Ag)Cadmium (Cd)Hafnium (Hf)

See all Transition metals

Technetium’s group 7 neighbours

Manganese (Mn)Rhenium (Re)Bohrium (Bh)

Group 7 of the periodic table