Answer :
An atom is the smallest unit of an element that can exist alone. when atoms are chemically bounded together they form a compound. the smallest particle of a compound is called a molecule.
The smallest particles of elements or compounds that can exist independently are called molecules. Molecules are formed by chemically bonding two or more atoms. A group of atoms held together by chemical forces. A molecule is the smallest unit of a chemical compound that can exist alone and retain all of its chemical properties.
When atoms combine to form covalent bonds the resulting collection of atoms is called a molecule. Therefore, we can say that molecules are the simplest units of covalent compounds. Cells are usually the smallest units considered living and the basic unit of life. All organisms are made up of cells from single cells to trillions of multicellular organisms.
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