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A molecule is the smallest particle of a substance that exists independently. Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. Look at the model of oxygen above.The two balls represents the two oxygen molecules. molecule is the smallest particle of a substance that exists independently. Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. Look at the model of oxygen above.
The cells of living things are made mainly of four elements: carbon, hydrogen, oxygen and nitrogen. They make up 96% of the atoms that are in living things, so they would be considered major chemicals.However, depending on how you define major, other elements that only make up a few percent of cells can top the list.he Big Four. Carbon, hydrogen, oxygen and nitrogen are known as the main âorganicâ elements because they form the building blocks that make life possible. Among the four, carbon is perhaps the most special, since it can form bonds with itself and makes molecules that have many different shapes.