Chemistry!

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Across
  1. 3. Smallest possible unit into which matter can be divided, while still maintaining its properties
  2. 4. The smallest particle in a chemical element or compound that has the chemical properties of that element or compound.
  3. 6. negatively charged particle
  4. 9. The mass of a given atom or molecule. Number of protons and neutrons added together.
  5. 10. A mixture that does not appear to be the same throughout.
  6. 11. a particle with no charge
Down
  1. 1. A mixture that appears to be the same throughout.
  2. 2. number The number of protons in the nucleus of an atom.
  3. 5. Simplest form of pure substance.They cannot be broken into anything else by physical or chemical means.
  4. 7. Two or more substances that are not chemically combined with each other and can be separated by physical means. The substances in the mixture retain their individual properties.
  5. 8. positively charged particle