Matter Vocab

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