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

TOLUENE, HOW TOLUENE CAN BE PREPARED

HOW TOLUENE CAN BE PREPARED

Electrochemistry, explain the construction of calomel electrode.explain how...

explain the construction of calomel electrode.explain how this electrode is used to determine the potential of an unknown electrode

Qualitative Analysis of Cations, We are asked to design a qualitative analy...

We are asked to design a qualitative analysis scheme that can be used to determine which cations are present in a solution containing only four of the following cations: Pb2+, Ag+,

The non-metallic elements is formed, A bond with maximum covalent character...

A bond with maximum covalent character between non-metallic elements is formed: (1) Between identical atoms (2) Between chemically similar atoms (3) Between atoms of wide

The formal charge on the hydrogens are, The formal charge on the hydrogens ...

The formal charge on the hydrogens are The formal charge on all the hydrogens is 0. For the other atoms: (a) Nitrogen has a complete octet and a formal charge of 0. (b) B

Moles to grams, determine the no of atom in 4.5g of k

determine the no of atom in 4.5g of k

Colloids, conclusion for assignment on topic applications of colloids

conclusion for assignment on topic applications of colloids

Describe actinoids and its properties., The series of elements involving th...

The series of elements involving the filling of 5f-orbitals is called actinoids series. They follow Ac (89) and include the fourteen elements from Th (90) and Lw (103). The chem

Ionic compounds do not have, Ionic compounds do not have: (1) Hard and ...

Ionic compounds do not have: (1) Hard and brittle nature (2) High melting and boiling point (3) Directional properties (4) Soluble in polar solvents Ans:  Direction

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