Chemistry

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Across
  1. 4. subatomic particle with a neutron charge
  2. 7. a group with hydrogen + halogens + noble gases
  3. 10. atomic number of 1
  4. 12. an atom or molecule with a net electric charge
  5. 13. the center of an atom containing proteins and neutrons
  6. 14. a positive ion
  7. 16. the element with an atomic number of 25
  8. 18. group 16 period 4
  9. 19. subatomic particle with a negative charge
Down
  1. 1. subatomic particle with a positive charge
  2. 2. a group of elements within the same column
  3. 3. a negative ion
  4. 5. the most reactive alkali metal
  5. 6. period 2 group 14
  6. 8. a family with properties intermediate between metals and nonmetals
  7. 9. a group of elements within the same row
  8. 10. group 8 period 7
  9. 11. a halogen with a -1 charge
  10. 15. group 17, 7 valence electrons
  11. 17. group 0, do not need to give up or gain