Transcription of THE p -BLOCK ELEMENTS - NCERT
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THE p -BLOCK ELEMENTS - NCERT
307 C:\ChemistryXI\Unit-11\Unit-11-F\Unit-11 (reprint).pmd, Reprint p -BLOCK ELEMENTSUNIT 11 After studying this unit, you will beable to appreciate the general trends in thechemistry of p -BLOCK ELEMENTS ; describe the trends in physical andchemical properties of group 13 and14 ELEMENTS ; explain anomalous behaviour ofboron and carbon; describe allotropic forms of carbon; know the chemistry of someimportant compounds of boron,carbon and silicon; list the important uses of group 13and 14 ELEMENTS and p - block ELEMENTSIn p -BLOCK ELEMENTS the last electron enters the outermostp orbital. As we know that the number of p orbitals is threeand, therefore, the maximum number of electrons that canbe accommodated in a set of p orbitals is six.
melting point and high electrical conductivity. It is worthwhile to note that gallium with unusually low melting point (303K), could exist in liquid state during summer. Its high boiling point (2676K) makes it a useful material for measuring high temperatures. Density of the elements increases down the group from boron to thallium.
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