Question

3. Which element is the least reactive?
A. Na B. Ca C.P D. Ne

Answer 1

Noble gases
Noble gases are the least reactive of all known elements. That's because with eight valence electrons, their outer energy levels are full. The only exception is helium, which has just two electrons

Answer 2

Noble gases are the least reactive, so that is He, Ne, Ar, Kr, Xe, Rn, Og.

Step-by-step explanation: