Transcription of THE s -BLOCK ELEMENTS - NCERT
{{id}} {{{paragraph}}}
Example: bankruptcy
THE s -BLOCK ELEMENTS - NCERT
291 C:\ChemistryXI\Unit-10\Unit-10-Lay-3(rep rint).pmd Reprint s -BLOCK ELEMENTSThe s -BLOCK ELEMENTS of the Periodic Table are those inwhich the last electron enters the outermost s-orbital. Asthe s-orbital can accommodate only two electrons, twogroups (1 & 2) belong to the s -BLOCK of the Periodic 1 of the Periodic Table consists of the ELEMENTS :lithium, sodium, potassium, rubidium, caesium andfrancium. They are collectively known as the alkali are so called because they form hydroxides onreaction with water which are strongly alkaline in ELEMENTS of Group 2 include beryllium, magnesium,calcium, strontium, barium and radium. These elementswith the exception of beryllium are commonly known asthe alkaline earth metals. These are so called because theiroxides and hydroxides are alkaline in nature and thesemetal oxides are found in the earth s crust*.
Li+> Na + > K+ > Rb + > Cs + Li+ has maximum degree of hydration and for this reason lithium salts are mostly hydrated, e.g., LiCl· 2H 2O 10.1.5 Physical Properties All the alkali metals are silvery white, soft and light metals. Because of the large size, these elements have low density which increases down the group from Li to Cs. However,
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: