### s-block Elements (Alkali and Alkaline Earth Metals)

goals
Diagonal relationship of elements in due to same:
Sodium Sulphate $(Na_2SO_3)$ is added to meat as a preservative. The presence of $Na_2SO_3$ can be detected by addinh dil.$H_2SO_4$ when the pungent smelling gas evolved turns the lime water milky. The gas evolved was detected as sulphur dioxide. The $SO_2$ evolved was dissolved in water and it requires $I_2$ solution in order to oxide $SO_2$ to ${SO_4}_{2-}$ in titration.
$SO_2+2H_2O+I_2 \rightarrow 4H^++{SO_4}^{2-}+2I^-$
In order to check the results of titration , excess barium chloride is added to the final solution. The resulting precipitate is collected and weighed.

Write the electronic configuration of the given element/ion in absence of Aufbau Principle.
Compare and contrast the chemistry of group 1 metals with that of group 2 metals with respect to the following:
Two inorganic compounds (A) and (B) are obtained by treating calcium orthophosphate with magnesium metal. (A) on hydrolysis produces a gas (C). The gas (C) was burnt in excess air to yield compound (D). (D) reacts with (B) to produce (E). [Atomic mass of $P =31g, Ca =40g; Mg =24 g, O=16 g)$.