An element is any naturally occurring substance found on Earth that is normally identified by the atomic number (option D).
What is an element?
An element is the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
Chemical elements are arranged in accordance with their atomic numbers on the periodic table.
Each element has its own unique symbol but are usually identified by its atomic number. All elements possess its own atomic number.
Therefore, an element is any naturally occurring substance found on Earth that is normally identified by the atomic number.
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