****** CHEMISTRY *******

* S BLOCK ELEMENTS 
* Alkali metals show only +1 oxidation state .
* Alkali metals salts are diamagnetic and colourless. 
* In aqueous solution , the largest ion is Li+(aq).
* On flame test k give violet colour 
* NaF is the higest melting halide.
* Alkali metal give colour in bunsen flame due to low ionization potential 
* sodium reacts  with  water more vigorously than lithium because it  has low  m.p .
* CS material used in photoelectric cell.