Alexander H Crossword

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Across
  1. 7. highly reactive non-metal elements
  2. 8. the lightest not naturally occurring element
  3. 9. Sn
  4. 10. the study of colors emitted by particles
  5. 12. The heaviest natural element
  6. 14. The columns of elements on the periodic table
  7. 15. a group of elements that do not react
  8. 16. the number of electrons or protons on a neutral atom
Down
  1. 1. the electrons found on the furthest orbital from the nucleus
  2. 2. the study of the different elements
  3. 3. negatively charged particles that is part of an atom
  4. 4. negatively charged ion
  5. 5. the different rows of elements of the periodic table
  6. 6. the lightest noble gas
  7. 11. A positively charged ion
  8. 13. a model used to visualize the structure of an atom
  9. 15. the neutral particle that is part of the nucleus of an atom