ATOM, The smallest unit of matter that makes up everything around us. It is the basic building block of all substances, including solids, liquids, and gases. They are made of smaller particles called protons, neutrons, and electrons., MOLECULE, A group of two or more atoms that are chemically bonded together. Molecules can be made up of the same type of atoms or different types of atoms, ATOMIC NUMBER, A key feature of an element is the number of protons in its atoms, which helps define what that element is, MOLECULAR MASS, The total mass of a molecule, measured in atomic mass units (amu). It is calculated by adding up the masses of all the atoms in the molecule., SPECIFIC MASS, Often referred to as DENSITY, is a measure of how much mass is contained in a given volume of a substance. It tells us how compact or heavy a material is., PERIODIC TABLE OF ELEMENTS, A chart that organizes all known chemical elements based on their properties. The atomic number is usually found above the element symbol in the periodic table., CHEMICAL PROPERTIES, A characteristic of a particular substance that can be observed in a chemical reaction, COMPOUNDS, Two or more molecules or two or more elements combine to form a new substance with distinct physical and chemical properties, known as a compound., ELEMENTS, Pure substances made up of the same atoms, MIXTURE, A combination of two or more substances in any proportions, BOND, Attraction between two atoms

Cornerstone 1: Atomic Composition

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