Trends in s-block

(a) recall the typical behaviour of the elements of group 1 and group 2 with oxygen, water and of group 2 with dilute acids and trends in their general reactivity. 

Group 1 

All alkali metals react with WATER with increasing violence down the group. 

2Na+2H2O ------> 2NaOH + H2 

All s-block elements burn in air…