element scientific definition
Science Chemistry for Kids. An element is a pure substance that is made from a single type of atom. Elements are the building blocks for all the rest of the matter in the world.Examples of elements include iron, oxygen, hydrogen, gold, and helium.Atomic Number. An important number in an element is the atomic number.ydrogen is the first element and has one proton, so it has an atomic number of 1. Gold has 79 protons in each atom and has an atomic number of 79. Elements in their standard state also have the same number of electrons as protons.