Tellurium

                                                  Element 52 : Tellurium 
Atomic Number 52
Atomic Mass 127.6 g.mol -1
Electronegativity according to Pauling 2.1
Density 6.24 g.cm-3
Melting Point 450 °C
Boiling Point 1390 °C
Van Der Waals radius 0.137 nm
Ionic Radius 0.221 nm (-2) ; 0.089 nm (+4)
Isotopes 23
Electronic Shell [ Kr ] 4d10 5s25p4
Energy of First Ionisation 869.0 kJ.mol -1
Discovered Franz Muller von Reichenstein in 1782

Tellurium (Te) is a chemical element with atomic number 52, discovered by Franz muller Von Reichenstein in the year 1782. It is a rare, brittle, mildly toxic and silvery white metalloid. Tellurium gives a greenish blue flame when burnt in the air. It does not dissolve or react with water or hydrochloric acid, but dissolves in nitric acid.

Tellurium has no biological role. However, some fungi use it as a substitute of sulphur.

Learn all the elements in Byju’s Interactive Periodic Table

Applications of Tellurium

  • Metallurgy is the prime application of Tellurium. It is used making iron, stainless steel, lead and copper alloys.
  • It is also used in manufacture of solar panels, memory chips and optical modulators.
  • Tellurium and its components are used as pigments for ceramics.
  • Used in manufacture of rubber that is highly resistant to heat.

Health effects of Tellurium

As it is a very rare element, it is very rare a normal human can encounter it. But when inhaled it may cause many serious health problems which include drowsiness, metal taste, headache and dry mouth.


Practise This Question

Two glass bulbs A and B are connected by a very small tube of negligible volume having a stop cock. Volume of bulb A is 100 cm3  and it contains some gas. Bulb B is empty on opening the stop cock, the pressure dropped by 60%. The volume of Bulb B must be____.