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

PERIODIC TABLE, PERIODIC TABLE and PERIODICITY OF ELEMENT

PERIODIC TABLE and PERIODICITY OF ELEMENT

Chemical properties proteins - oxidation, Chemical Properties Proteins - Ox...

Chemical Properties Proteins - Oxidation Oxidation : Proteins are oxidised on putrefaction and burning. The products comprise amines, nitrogen, carbon dioxide and water. The un

Shiff base, i am synthesing the azipines and i wana to fet the azipine with...

i am synthesing the azipines and i wana to fet the azipine with different subsituites. how can i get with triflouro subsituited azipines?

Structural needs for hyperconjugation, Structural needs for hyperconjugatio...

Structural needs for hyperconjugation (i) Compound could comprise at least one Sp 2 -hybrid carbon of as well alkene alkyl carbocation or alkyl free radical. (ii) ∝- carbon

What do you mean by fusion reactors, Q. What do you mean by Fusion Reactors...

Q. What do you mean by Fusion Reactors? Ans. It is pretty difficult to achieve fusion in the laboratory. A lot of energy is needed to initiate the fusion process and the

Classification of organic compounds, Q. Classification of Organic Compounds...

Q. Classification of Organic Compounds?Groups of Organic Compounds? Ans. Organic compounds are classified on the basis of their functional groups. The common groups of org

Tyndall effect, what is tyndall effecet? can you give an example

what is tyndall effecet? can you give an example

Show the characteristic baked flavour bread, Q. Show the characteristic bak...

Q. Show the characteristic baked flavour bread? Bread has its own characteristic baked flavour. This flavour diminishes with shelf life. A freshly baked bread would have intens

Points to be taken into account to compare the enol %, What are the points ...

What are the points to be taken into account to compare the enol %? Ans) Different propositional proof system for theorem proving in propositional logic, like sequent calculus,

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