What is the reactivity of an element when it has reached the maximum number of valence electrons?

Valance electrons means that the element has not reached the octet configuration and is therefore reactive the reactivity depends on the no. of valance electrons the more valance electrons the more unstable the atom is and the more reactive it is. The gasses like helium neon xenon are all inert which means they have an octet configuration and have no delocalised or valance electrons.