Why are some basic concepts of chemistry ncert notes provided in PDF?
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9th Jul, 2025
PDFs make it easy for students to access, download, and study chapter-wise notes anytime, anywhere. They provide a convenient, organised, and portable format for quick learning and exam revision.
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An element is a pure substance that cannot be broken down into simpler substances by ordinary chemical means. It consists of only one type of atom. A compound, on the other hand, is a substance made up of two or more elements chemically combined in a fixed ratio. For example, water (H₂O) is a compound made up of hydrogen and oxygen atoms.
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