Some information about four elements, $$\(P, Q, R\)$$ and $$\(S\)$$, is shown. Which elements are transition elements?

9.4.1. State the order of the reactivity series as: potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, hydrogen, copper, silver, gold

9.4.2.1. potassium, sodium and calcium with cold water

9.4.2.2. magnesium with steam

9.4.2.3. magnesium, zinc, iron, copper, silver and gold with dilute hydrochloric acid and explain these reactions in terms of the position of the metals in the reactivity series

9.4.3. Deduce an order of reactivity from a given set of experimental results

9.4.4. Describe the relative reactivities of metals in terms of their tendency to form positive ions, by displacement reactions, if any, with the aqueous ions of magnesium, zinc, iron, copper and silver

9.4.5. Explain the apparent unreactivity of aluminium in terms of its oxide layer