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  • This diagram divides the essential elements into 3 main groups.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 17 September 2009, Updated 4 April 2019 Size: 250 KB Referencing Hub media

    25 elements1 are known to be essential to life. This diagram divides the essential elements into three main groups depending on the amount needed.

    1. element: A substance made of atoms that all have the same atomic number. Elements cannot be split into simpler substances using normal chemical methods.
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    2. A substance made of atoms that all have the same atomic number. Elements cannot be split into simpler substances using normal chemical methods.