A pure substance that cannot be changed into simpler substances through chemical or physical means is called an element. Elements are fundamental building blocks of matter and consist of only one type of atom. Examples include hydrogen (H), oxygen (O), gold (Au), and carbon (C). Unlike compounds, which can be broken down into simpler substances, elements are the simplest forms of matter that retain their chemical properties.
a pure substance that cannot be changed into simpler substances through chemical or physical means
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