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

Initial radical concentration, (a) Given the values below, Determine the co...

(a) Given the values below, Determine the concentration of benzoyl peroxide needed to prepare polystyrene with a number average molar mass of 400,000 by bulk free radical polymeris

Explain the basic idea of how to develop a new product, Normal 0 ...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 How To Develop A Ne

Organic, chain shortening in aldoses

chain shortening in aldoses

The nature of bonding in graphite, The nature of bonding in graphite is: ...

The nature of bonding in graphite is: (1) Covalent                                       (2) Ionic     (3) Metallic (4) Coordinate Ans: Covalent

Characteristics of tautomerism - isomerism, Characteristics of tautomerism ...

Characteristics of tautomerism (a) Tautomerism (cationotropy) is caused by the oscillation of hydrogen atom between two polyvalent atoms present in the molecule. The modificati

Oxides of boron and aluminium, All the elements of Group 13 form trioxides ...

All the elements of Group 13 form trioxides also known as sesquioxides of the  formula, M 2 O 3 . Thallium forms stable Tl 2 0 also. The basic character of oxides increases down th

Explain the heat of formation of the gases, Take these values into account ...

Take these values into account and comment on the relation between the heat of formation of the gases and the vibrational frequencies again.

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