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Carbon

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A chemical element with symbol C and atomic number 6, essential for all known life.

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Oxygen

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A chemical element with symbol O and atomic number 8, essential for respiration.

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Hydrogen

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A chemical element with symbol H and atomic number 1, the most abundant element in the universe.

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Nitrogen

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A chemical element with symbol N and atomic number 7, making up 78% of the Earth's atmosphere.

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Sulfur

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A chemical element with symbol S and atomic number 16, known for its role in amino acids and proteins.

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Phosphorus

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A chemical element with symbol P and atomic number 15, important for energy transfer in cells.

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Organic compound

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A compound that contains carbon and is found in living things.

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Inorganic compound

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A compound that does not contain carbon-hydrogen bonds.

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Hydrocarbon

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An organic compound consisting entirely of hydrogen and carbon.

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Carbohydrates

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Organic compounds made of carbon, hydrogen, and oxygen, serving as a major energy source.