Naturally occurring:
* DNA: A single molecule of DNA can contain billions of atoms, depending on the organism. It's composed of nucleotides, each of which contains a sugar, a phosphate group, and a nitrogenous base.
* Proteins: Proteins are chains of amino acids, and can vary greatly in size. Some proteins, like titin, can contain tens of thousands of atoms.
* Polysaccharides: These are long chains of sugar molecules. Starch and cellulose, both composed of many glucose molecules, are examples of polysaccharides with many atoms.
Synthetic:
* Polymers: Many synthetic polymers, like polyethylene and polypropylene, have long chains of repeating units. These chains can be very long, containing thousands or even millions of atoms.
* Fullerene: Buckyballs, a type of fullerene, are spherical molecules composed entirely of carbon atoms. Some fullerenes can contain hundreds of atoms.
The specific number of atoms in a molecule depends on its structure and the types of atoms it contains. So, there's no single molecule that holds the "record" for the most atoms!
