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 ...

an element contains just one type of atom a compound contains two or more types of atom joined together a mixture contains two or more different substances that are not joined together the different ...

Explore the 25 World's Most Dangerous Substances, from natural toxins like Botulinum to man-made chemicals. Understand their ...