Answer: Chlorine will be more reactive.
Explanation:
Chemical reactivity is defined as the tendency of an element to loose of gain electrons.
Non-metals are the elements which gains electrons and hence, their chemical reactivity will be the tendency to loose electrons.
Their chemical reactivity increases as we move from left to right in a period because the valence shell come closer to nucleus as we move from left to right.
So, addition of new electron in the valence shell becomes easier due to greater attraction between nucleus and valence electron.
We are given:
Silicon is present in Group 14 and chlorine is present in group 17.
Hence, chlorine will be more reactive.
