they are unreactive as they have a full outer shell of electrons
No, they are the least reactive gasses.
Not at all! they are not reactive
No. They are the least because their energy levels are full.
noble gases are least reactive
Noble gasses are least reactive of all the elements. So the least reactive element in the period 4 is Krypton. It is a noble gas with an atomic number of 36.
Non-reactive, along with all other noble gasses.
Inert gases
Less reactive non metals are in the 18th group. They are noble gasses. From all the noble gasses, Xe is the only gas which forms compounds.
Noble gases are least reactive because they have a full shell
The external shell of electrons is full.
Noble gases have completely filled outer electronic configuration. Hence they are non-reactive.
helium