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An element is a substance consisting of atoms which all have the same number of protons-i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods. Although an element's atoms must all have the same number of protons, they can have different numbers of neutrons and hence different masses.
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.