Question

prepare seminar about borown compounts​

Answer 1

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Explanation:

Boron Chemistry Boronis the element of group13(IIIA), havingatomic number 5 and atomic mass 10.811. First,Boronwas mentioned in book of Persian alchemist Rhazes. In 1892,French Chemist Henri Moissanproducedboronthat was 98% pure. The originof boronis attributedto Big Bang or galactic cosmic raysevents as well as the formation of Li and Be.

3. Chemistry It is a semiconductors,characteristicsof both metals and non metals. The abundanceof boronis very low, approximately10-9times that of hydrogenand around10-6 of carbon and oxygen. Physicalproperties It occurs in many physicalforms called allotropes. Boronatoms are able to absorb a large number of neutrons. Two typesof isotopesof boron exist,boron-10and boron-11.Three radioactiveisotopesof boron are knownalso.

Answer 2

Answer:

Compounds

In its compounds boron shows an oxidation state of +3. The first three ionization energies of boron, however, are much too high to allow formation of compounds containing the B3+ ion; thus, in all its compounds boron is covalently bonded. That is, one of boron’s 2s electrons is promoted to a 2p orbital, giving the outer electron configuration 2s12p2; the s and p orbitals can then be mixed to give sp2 and sp3 hybrids, which allow boron to be three- and four-coordinated, respectively. The three-coordinated derivatives (e.g., halides, alkyls, aryls) are planar molecules that readily form donor-acceptor complexes (called adducts), with compounds containing lone pairs of electrons; in these adducts the boron atom is four-coordinated, the four groups being tetrahedrally disposed around it. The tetrahedral bonds result from the reception of an unshared pair of electrons from a donor atom—either a neutral molecule or an anion. This allows a variety of structures to form. Solid borates show five types of structures involving several anions (i.e., BO33-, formed of boron and oxygen) and shared-electron bonds. The most familiar borate is sodium tetraborate, commonly known as borax, Na2B4O7∙10H2O, which occurs naturally in salt beds. Borax has long been used in soaps and mild antiseptics. Because of its ability to dissolve metallic oxides, it has also found wide applications as a soldering flux.