Percentage composition of atom in the molecule is a structure of compound presented in the shape of a percentage of its mass, which comes from every element.
Generalic, Eni. "Percentage composition of atom in the molecule." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. 2 Apr. 2025. <https://glossary.periodni.com>.
Glossary
Periodic Table