Transcription of THE s -BLOCK ELEMENTS - NCERT
{{id}} {{{paragraph}}}
Example: air traffic controller
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.
in the earth’s crust. Strontium and barium have much lower abundances. Beryllium is rare and radium is the rarest of all comprising only 10–10 per cent of igneous rocks† (Table 10.2, page 299). The general electronic configuration of s-block elements is [noble gas]ns1 for alkali metals and [noble gas] ns2 for alkaline earth metals. UNIT 10
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: