Reactivity. It is the ability of matter to combine chemically with other substances.
well you can't walk through the air but you can't walk through a concrete wall because all of the solid atoms holding it together
Alkaline earth metals are metals of group two. They are divalent metals and they have a highly negative reduction potential hence the metals are mostly extracted by electrolysis.
They are highly reactive metals. They react with water but do so less readily than alkali earth metals.
Owing to their high reactivity, they are seldom found free in nature. They always occur in combined state with other highly reactive nonmetals.
The answer is: b)16,200 seconds :)
