8th grade chemistry vocabulary

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Across
  1. 2. a negatively charged particle
  2. 3. metals group 1 on the periodic table; very reactive
  3. 4. the number of protons in the nucleus of an atom
  4. 6. group 2 on the periodic table; reactive
  5. 8. a positively charged particle
  6. 9. the central core of an atom
  7. 10. group 17 on the periodic table; very reactive
  8. 11. the mass of an atom of an element
Down
  1. 1. a chart of the elements showing repeating patterns of the elements
  2. 5. a small particle in the atom's nucleus with no electrical charge
  3. 7. group 18 on the periodic table; do not bond