atom - basic building block of matter, element - has only one type of atom, molecule - two or more atoms stuck together with a chemical bond, always with the same amounts. Two Examples: O2 or H2O, compound - A substance made with two or more elements stuck together with a chemical bond. Can be a molecule if it has the same amounts such as H2O, or different amounts such as plastic with different amounts of C and H atoms., extended structure - A substance made of atoms stuck together with chemical bonds, where the atoms or subunits repeat to create a large network. The size of the substance can vary to be a larger or smaller structure. Can be a compound (such as plastic) or element (such as carbon in diamond). , formula - Shows the elements and the number of each type of element that make up a molecule. Ex: H2O, coefficient - The number in front of a formula. It says how many sets of that molecule are shown. For example, 4CO2 means four carbon dioxide molecules., subscript - The small numbers in a chemical formula. They indicate how many atoms of the element in front of it are in the molecule. Ex: H2O means 2 Hydrogen atoms, 1 oxygen atom.,

Atoms, Elements, Molecules, Compounds, Extended Structures

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