Periodic Table Review

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Across
  1. 2. an outermost electron of an atom
  2. 4. the center of an atom
  3. 8. chart of the elements arranged into rows and columns
  4. 9. a subatomic particle that is positively charged and exists in the nucleus
  5. 11. the smallest piece of an element that still represents that element.
  6. 12. elements that have no metallic properties.
  7. 15. an element that has properties of both metals and nonmetals
  8. 18. the number of protons in an atom
  9. 22. an atom that is no longer neutral
  10. 23. the elements in group 2
  11. 24. the elements in groups 3-12
  12. 25. a group of chemical symbols and numbers that make up a compound.
Down
  1. 1. a subatomic particle that is neutral and exists in the nucleus
  2. 3. a model that represents valence electrons
  3. 5. the area where an electron is most likely to be found.
  4. 6. a row on the periodic table
  5. 7. the bond formed when two atoms share one or more pairs of valence electrons.
  6. 10. the sum of an element's protons and neutrons
  7. 13. the bond formed between positively and negatively charged ions
  8. 14. a column on the periodic table
  9. 16. the elements in group 1
  10. 17. an element in group 17
  11. 19. the elements of group 18
  12. 20. a subatomic particle that is negatively charged and exists outside the nucleus
  13. 21. a force that holds two or more atoms together