Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...

Everything that has mass and which occupies space is called 'matter'. The universe is constructed with matter and energy. Matter is made of very small particles and is constantly dynamic. It is ...

There are lots of different substances but only just over a hundred elements. An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each ...