Brainliesttt which families of metals are not so reactive, which allows them to exist by themselves in nature?

The answers are:1. Noble Gases,

2. The closer the element is to the noble gases the less reactive it is.Hope this helps !!! :)

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

answer: 45

explanationyou have to add as well to be it could be