Matter

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Across
  1. 4. Center of an atom
  2. 5. The NUMBER of protons an atom's nucleus
  3. 8. Sum of protons and neutrons in an atoms nucleus
  4. 10. A tiny partical that has mass and a positive energy charge.
Down
  1. 1. Classified and arranged, according to their chemical properties in the periodic table.
  2. 2. An atom that gains or loses one or more electron.
  3. 3. A Tiny particle with approximately the same mass as a proton
  4. 6. Atoms of the same element that have a different mass number
  5. 7. Can't be broken into simpler substances by physical or chemical mass.
  6. 9. Anything that has volume and mass