Sulfur, selenium and tellurium, Chemistry

Assignment Help:

SULFUR, SELENIUM AND TELLURIUM

The elements known commonly as the chalcogens are in the same group (16) as oxygen. They form some compounds same to those of oxygen, but show many differences characteristic of other nonmetal groups. Sulfur is widespread in the Earth's crust, finding as metal sulfides, sulfates, and native or elemental sulfur build by bacterial oxidation of sulfides. Many less electropositive metals known as chalcophiles are collect commonly as sulfide minerals, some important examples are sphalerite (zinc blende, ZnS), pyrites (FeS2), molybdenite (MoS2), galena (PbS) and cinnabar (HgS). Volatile sulfur compounds such as organic compounds and H2S are also collect in petroleum and natural gas. The element is used in bigger amounts for the manufacture of sulfuric acid (see below).

Tellurium and selenium are much rarer, found as minor components of sulfide minerals.

Sulfur has various allotropic forms, the most stable of which are molecular solids containing S8 rings. The elemental forms of Te and Se have spiral chains and are semiconductors. In all of those solids each atom forms two single bonds to neighbors. Sulfur collides directly with halogens (except I) and oxygen, and with many less electronegative elements to form sulfides. The other elements show same properties although reactivity declines down the group.

 


Related Discussions:- Sulfur, selenium and tellurium

Separation of mixtures, name the easiest method of obtaining diesel from a ...

name the easiest method of obtaining diesel from a mixture of petrol and diesel.

Which carbonate mineral reacts with cool dilute hydrochloric, Which carbona...

Which carbonate mineral reacts readily with cool dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas? Many carbonate minerals.

Covalent radius, Covalent/ionic/atomic radius of hex-1-ene

Covalent/ionic/atomic radius of hex-1-ene

Explain the oxidation product of the respiratory chain, Explain the oxidati...

Explain the oxidation product of the respiratory chain? How is the free energy kept at the inner mitochondrial membrane independently of chemical bonds, and how is it used for

What do you mean by dehydration, Q. What do you mean by Dehydration? Th...

Q. What do you mean by Dehydration? The word dehydration usually refers to the use of controlled conditions of heating, with the forced circulation of air/artificial dryer as

IONIC EQUILIBRIUM, OSTWALDS DILUTION LAW IS APPLICABLE TO WHAT

OSTWALDS DILUTION LAW IS APPLICABLE TO WHAT

What are total variables and degrees of freedom of a system, What are total...

What are total variables and degrees of freedom of a system of two components, when the number of phases is one, two, three etc.?  Ans:  For two - component systems, degree of

Assignment, Redox systems in bioinorganic chemistry

Redox systems in bioinorganic chemistry

Lowest vacant state., The π electrons of a conjugated molecule can be model...

The π electrons of a conjugated molecule can be modeled as a particle in a box where the box length is a little more than the length of the conjugated chain. The Pauli exclusion pr

Amino acids - biomolecules, Amino acids Proteins are a class of biologi...

Amino acids Proteins are a class of biologically significant substance. They are important to virtually all processes in living systems. A few of acids are hormones that offer

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd