s-BLOCK ELEMENTS

Flame Test : Alkaline earth metals : Calcium, strontium, and barium impart characteristic brick red, crimson red and apple green colours respectively to the flame. In flame the electrons are excited to higher energy levels and when they drop back to the ground state, energy is emitted in the form of visible light. The electrons in beryllium and magnesium are too strongly bound to get excited by flame. Hence, these elements do not imparts any colour to the flame . The flame test for Ca , Sr and Ba is helpful in their detection in qualitative analysis and estimation by flame photometry . The alkaline earth metals like those of alkali metals have high electrical and thermal conductivities which are typical characteristics of metals. Metals ( colour of flame ) : Be ( no colour ), Mg ( No colour ), Ca ( brick red ), Sr ( crimson red ), Ba ( apple green ). Next topic : Atomic properties, physical properties, and reaction of group 1 element (alkali metals ). To be continued ..............