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Across 1. Subatomic particle with a negative charge and located outside the nucleus. 3. A characteristic of a substance that can be observed. 5. the average mass number of all isotopes of an atom. Round this number to find the mass number of the atom. 7. A substance that mixes with another substance evenly and dissolves. 8. The smallest unit of matter that retains the identity of the substance. 9. subatomic particle with no charge, the same mass as a proton, and located in the nucleus of the atom. 12. The number of protons in the nucleus of an atom. This number identifies the atom 14. Amount of matter contained in a substance.

Down 2. Region surrounding the nucleus of an atom, where electrons are most likely to be found. 4. Ability to be stretched into a thin wire. 6. the number of protons and neutrons in the nucleus of an atom. Mass number = protons + neutrons 10. The central Part of the atom, containing protons and neutrons. 11. subatomic particle with a positive charge and located in the nucleus of the atom. 13. Transform from one form to another.