Unit 2 Study

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Across
  1. 2. poor conductors of electricity `
  2. 7. what kind of metal is magnesium?
  3. 11. negatively charged ion
  4. 12. what are the columns called on a periodic table?
  5. 13. very reactive
  6. 15. how many electrons does chlorine have?
Down
  1. 1. created the modern periodic table
  2. 3. positively charged ion
  3. 4. what are the rows called on a periodic table?
  4. 5. created the first periodic table
  5. 6. very low reactivity rate
  6. 8. Semiconductors
  7. 9. how many protons does germanium?
  8. 10. what kind of element is bromine?
  9. 14. what kind of element is Einsteinium?