Answer:

first of all I will answer your first question what is matter

matter is everything around US matter is defined as anything that has mass and take up space or occupy space or it has volume volume is the amount of space something OCCUPIES those atom goes on to BUILD the thing up see and touch every days

now I will answer your second question metals and nonmetals

metal is a type of solid substance that is usually hard sign sonoras lusturius and that heat and electricity and trans for travel through it metal usually have free electrons in the outermost cell

metal is a type of solid substance that is usually hard sign sonoras lusturius and that heat and electricity and trans for travel through it metal usually have free electrons in the outermost cell non metal is a type of substance that are usually not hard not sonorous not lusturies and which does not transfer heat and electricity but there are exception like diamond and graphite

now I will answer your third question what is reactivity series

the series in which the metal are arranged in the order of their reactivity is known as reactivity series

now I will answer your LAST question

reactive metals are POTASSIUM Sodium and Calcium

I hope it has helped you a lot✍✍✍✍❤️❤️❣️