matter

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Across
  1. 2. an atom that gains or loses one or more electrons from its outermost energy level has a net electric charge
  2. 5. has little mass, but it has a negative electric charge that is exactly the same magnitude as the positive charge of a proton
  3. 6. the smallest particle of an element that retains all the properties of that element
  4. 8. the number of protons in an atom’s nucleus
  5. 10. atoms of the same element that have different mass numbers
Down
  1. 1. a substance that cannot be broken down into simpler substances by physical or chemical means
  2. 3. a tiny particle with approximately the same mass as a proton, but it has no electrical charge.
  3. 4. a tiny particle that has mass and a positive electric charge
  4. 7. the sum of the protons and the neutrons in an atom’s nucleus
  5. 9. anything that has volume and mass