Recognizing chemical reactivity is linked to ion formation and hold on valence electrons, predict the trend in the chemical reactivity of non-metals, both within a period and a group, Explain your reasoning

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products