Question

Briefly explain the following observations.

1. Noble gases are generally unreactive.
2. Alkaline earth metals are generally less reactive than alkali metals in the same period. 

Answer 1

1. Noble gases are chemically stable because their outer energy level are full.
2. Alkali metals react by losing the one electron from their outermost energy level. 

Answer 2

1. Noble gases are chemically stable because their outer energy level are full.
2. Alkali metals react by losing the one electron from their outermost energy level which is easily lost compare to alkaline earth metal hence alkali metal is more reactive