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

Bonds, How do i know which compounds i should put a roman numeral in

How do i know which compounds i should put a roman numeral in?

Spectroscopy, list down example of spectroscopic methods based on interacti...

list down example of spectroscopic methods based on interaction of matter electromagnetic radiation?

Molarity, calculate the molarity of sodiun in 0.66ml water

calculate the molarity of sodiun in 0.66ml water

The given pairs co2 resembles, With which of the given pairs CO 2 resemble...

With which of the given pairs CO 2 resembles: (1) HgCl 2 , C2H 2                                  (2) HgCl 2 , SnCl 4     (3) C 2 H 2 , NO 2     (4) N 2 O and NO 2

Did nitrogen undergoes friedel-crafts reaction, I think you are talking abo...

I think you are talking about aniline(Nitrogen containing compounds) . If so then no, they do not undergo friedel craft as nitrogen donates its lone pair to form a complex and do

Optical glass, Optical glass: They contain phosphorous as replacement for ...

Optical glass: They contain phosphorous as replacement for most of all the silica and lead silicate, containing a little CaO 2 , the latter is capable of absorbing ultraviolet lig

Castenar kelner process, in castner kelnar process sodium metal extract at ...

in castner kelnar process sodium metal extract at cathode and calcium also why they do not mix if they extract at same chamber?

How will u synthesize the 1, Ethelene+diaminotetraacetate---->1,4- diaminob...

Ethelene+diaminotetraacetate---->1,4- diaminobutane from ethylene CH 2 =CH 2 +EDTA---->NH 2 -CH 2 -CH 2 -CH 2 -CH 2 -NH 2

Uses of proteins - biomolecules, Uses of Proteins (a) Proteins constitu...

Uses of Proteins (a) Proteins constitute as necessary part of our food. Meat, eggs, fish, cheese offer proteins to human beings. (b) In textile: Casein (a milk protein) is u

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