Atoms, Elements and Compounds

• An atom is the smallest part of a chemical element that can exist.
• Protons have a positive charge (+1), while electrons have a negative charge (-1).
• Atoms are made up of protons, neutrons, and electrons.
• Neutrons do not carry an electrical charge (0)
• An element is a substance that cannot be broken down into simpler substances by chemical means.
• An example of elements are helium (He), hydrogen (H), oxygen (O), neon (Ne) and more.
• Compound examples include water (H2O), carbon dioxide (CO2), ammonia (NH3), sulfuric acid (H2SO4), sodium chloride (NaCl), calcium oxide (CaO), etc.
• Elements can exist as single atoms or combine to make compounds.
• A compound is formed when two or more different elements chemically bond together.