Atoms: smallest unit of an element.
Molecule: smallest unit of a compound., combination of atoms of the same or different elements., a group of atoms chemically bonded together. Both: divisible by chemical or nuclear means, smallest unit that can be isolated through physical changes.
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A chemical formula gives the number ratio of the different kinds of atoms present in the compound. This means that the ratios are the same if you count in individual atoms, dozens of atoms, or molecules of atoms.
Atoms are divisible They are made up of sub-atomic particles including quarks, protons, neutrons, electrons, ect.
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The coefficient is a count of the number of molecules of each substance in a chemical process. The subscript is the number of atoms of an element in each molecule.
The "big 4" in 4H2 refers to the four hydrogen (H) atoms in the chemical compound. The "2" indicates that there are two molecules of the compound. Therefore, 4H2 represents a molecule composed of four hydrogen atoms.