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Across 2. The smallest unit of any element that still keeps the same properties of that element. 4. The region around a nucleus (of and atom) that electrons are commonly found. 5. The central region of an atom made up of protons and neutrons. 6. The amount of neutrons and protons in a nucleus. 7. The mass of an atom in atomic mass units. 9. A subatomic particle in an atom with a negative charge. 10. A subatomic particle in an atom with no charge. (Located in the nucleus)

Down 1. An atom that has a different number of other atoms but the same amount of protons, making it have a different atomic mass. 2. A unit of mass that helps describe the mass of a molecule or atom. 3. The amount of protons that are within the nucleus of an atom. 8. A subatomic particle in an atom with a Positive charge. Located in the nucleus. ______ are what make up the atomic number (FE (Iron) has the atomic number of 26; It has 26 _____)