By J. Bassett

ISBN-10: 0080112072

ISBN-13: 9780080112077

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2) A small cation. The close approach possible between a small cation and a neighbouring anion results in enhanced polarization of the outermost electrons of the anion. (3) A large anion. The outermost electrons of a large anion are more easily pulled towards the cation than those of a smaller anion, since they are further from the positively charged anion nucleus. (4) A cation with a non-noble gas type of electronic configuration. Cations 2 6 10 outermost shell are more with an 18-electron (s p d ) 2 6 strongly polarizing than those of the 8-electron type (s p ).

5. The formation of sp hybrid orbitals. be noted that the larger lobe of each of these hybrid orbitals protrudes further along the axis than the original p orbital. 6). In the case of the boron atom, the formation of simple molecules such as boron trichloride requires that three unpaired electrons are made available for bonding. The electronic configuration of the λ 2 2 boron atom is 1 J 2s 2ρχ , so that by promoting a 2s electron into 57 T Y P E S OF C H E M I C A L B O N D 2 1 λ a 2p orbital the excited state Is 2S 2ρχ λ is attained with its 2ρυ three unpaired electrons.

The periodic classification of the elements was developed in 1869 by MendeléefT and simultaneously and independently by Lothar Meyer. The elements were arranged in order of their atomic weights and were set out in the form of a table, which consisted of a number of horizontal rows or periods and eight vertical columns or groups. The periodicity of chemical properties was emphasized by MendeléefT, who placed chemically similar elements in the same group even though this meant leaving certain gaps in the table.

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Inorganic Chemistry. A Concise Text by J. Bassett


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