Chapter 9: Matter is Made of Atoms

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Across
  1. 5. 1 less electron than proton
  2. 6. equal to the number of protons plus neutrons
  3. 7. 1 more electron than proton
  4. 10. Tiny, very light particles, have a negative electrical charge and move around the outside at the nucleus
  5. 11. the number of protons for a given atom never change
  6. 12. Large and Heavy like protons, have no electrical charge, located in the nucleus of the atom
Down
  1. 1. number a number of protons
  2. 2. an electron in the outer most energy level of an atom
  3. 3. Designer of the periodic table
  4. 4. Much larger and heavier than electrons, have a positive charge, located in the nucleus of the atom
  5. 8. Are often used for things that are too small or too large to be observed or that are too difficult to be understood easily.
  6. 9. neither the number of protons or neutrons change in this