C . H . O .
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The three main elements found in macromolecules are carbon, hydrogen, and oxygen. These elements are essential for building the complex structures of biological macromolecules like proteins, carbohydrates, and lipids. Additional elements like nitrogen, sulfur, and phosphorus can also be present in certain macromolecules.
The three elements found in all biological macromolecules are carbon, hydrogen, and oxygen. These elements are present in varying ratios and arrangements in carbohydrates, lipids, proteins, and nucleic acids, which together form the building blocks of life.
There are only 2 elements in water: hydrogen and oxygen.
The four main classed of macromolecules are Proteins, Sugars, Lipids and nucleic acids. Carbon is an element found in all classes. In protein it part of at least the carboxylic acid of the amino acid and the ever present alpha carbon. In Sugars carbon always form the backbone and the same in lipids. In nucleic acid carbons are found in the sugar moiety as well as the nitrogen base. Hydrogen is also always present - quite trivial. Oxygen is also trivial for all. Nitrogen is found in all proteins, all nucleic acids some sugar derivatives and very seldomly in lipid.
Group 3 of the periodic table contains many of the radioactive elements.
Synthetic elements are found in the group of transuranium elements, which are elements with atomic numbers higher than uranium (92) on the periodic table. These elements are artificially created in a laboratory through nuclear reactions and have unstable nuclei.