Question

Give a brief account of the following:  

(a) Blue colour solutions of alkali metals in liquid ammonia. 

(b) Tendency to form divalent compounds of alkaline earth metals than monovalent. 

(c) Tendency to give flame colours by alkali metals.

Answer 1

(a) Due to the presence of ammoniated electron. 

(b) In divalent oxidation state the octet is complete. 

(c) Due to less ionisation enthalpy of alkali metals.