Periodic Table/Atoms Crossword Puzzle

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Across
  1. 5. Elements that are able to form anions, acidic oxides,acids,and stable compounds with Hydrogen,carbon is an example of this
  2. 6. The number of protons in an element's atom,determines place on the Periodic Table
  3. 9. The average added weight of protons and neutrons of an elements isotopes
  4. 12. Particles smaller than an atom
  5. 14. Table of chemical elements arranged by atomic number
  6. 18. Group 18 on the Periodic Table,made up of gases,have a "full outer shell".
  7. 19. Subatomic particles with a positive charge,found I an atom's nucleus
  8. 20. Vertical columns on the Periodic Table
  9. 21. Elements that form cations and have metallic bonds,iron is an example of this
  10. 22. Electrons on "outer shell" that can form bonds with other elements
  11. 24. Positively charged ions
  12. 25. The center of an atom,made up of protons and neutrons
Down
  1. 1. Another name for groups
  2. 2. Negatively charged ions
  3. 3. Group 1 on the Periodic Table, highly reactive,has 1 valence electron
  4. 4. Group 2 on the Periodic Table,slightly less reactive than group 1,has 2 valence electrons
  5. 7. The elements when arranged in order of atomic number show periodic variation of atomic structure and most of their properties
  6. 8. Atom's of elements where the number of neutrons change
  7. 10. Subatomic particles with no charge,found inside an atom's nucleus
  8. 11. Elements whose characteristics fall between metals and solid nonmetals,boron is an example of this.
  9. 13. Horizontal rows on the Periodic Table
  10. 15. Atom of an element where the charge of the particle changes
  11. 16. Subatomic particles with a negative charge
  12. 17. Group 17 on the Periodic Table, highly reactive, has 7 valence electrons
  13. 23. Smallest unit of chemical matter