Between copper and sodium, which metal is more reactive? Explain with reason

Explanation

Sodim metal is more reactive than copper, because:
(i) Sodium reacts with oxygen easily to form sodim oxide but copper does not react with oxygen easily.
(ii). Sodium reacts vigorously with cold water to form sodium hydroxide and hydrogen but copper does not react even with steam.
(iii). Sodium reacts rapidly with dilute hydrochloric acid to form sodium chloride and hydrogen, ut copper does not react with dilute hydrochloric acid.
Before we describe the reaction of metals with salt solutions, we should know the meaning of the reactivity series of metals'. this is known as reactivity series of metals because it tells us the relative chemical reactivities of metals towards other elements. please note that the 'reactivity series of metals' is also known as 'activity series of metals'. So, let us now discuss the reactivity series of metals or the activity series of metals.