Matter

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Across
  1. 3. a substance made up of various types of particles that occupies physical space and has inertia.
  2. 5. a stable subatomic particle with a charge of negative electricity
  3. 7. an atom or molecule with a net electric charge
  4. 8. number the number of protons in the nucleus of an atom,
  5. 9. number the total number of protons and neutrons in a nucleus.
Down
  1. 1. a part or aspect of something abstract,
  2. 2. a stable subatomic particle occurring in all atomic nuclei,
  3. 4. a subatomic particle of about the same mass as a proton but without an electric charge
  4. 6. the central and most important part of an object, movement, or group,
  5. 7. each of two or more forms of the same element that contain equal numbers of protons