Elements

There are 118 chemical elements that we know of, 94 occurring naturally on Earth, while the rest are synthetic elements that have to be created in a lab. Elements cannot be broken down into any maller substance, and their atomic number describes the number of protons orbiting its nucleus. Elements are the building blocks of all that we know, but despite this, constitute only 15 per cent of all matter in the Universe - the rest is mysterious "dark matter" or "dark energy".

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