Periodicity

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Across
  1. 3. group 17/group VIIA
  2. 6. a column of the periodic table
  3. 7. an ion or molecule attached to a metal atom by coordinate bonding
  4. 10. the number of atoms, ions, or molecules that a central atom or ion carries in a complex or coordination compound
  5. 12. rare-earth metals
  6. 14. monovalent elements in group 1/group IA
  7. 18. gaseous elements in group 18/group 0
  8. 19. radioactive elements
  9. 20. variable valence and a strong tendency to form coordination compounds
  10. 21. a row of the periodic table
Down
  1. 1. chemical elements are arranged in rows and columns with similar chemical properties
  2. 2. the phase of catalysts differs from that of the reactants or products
  3. 4. chemical compound that binds tightly to metal ions
  4. 5. the total charge in the nucleus of all the protons
  5. 8. ions containing more than one atom
  6. 9. electrically uncharged materials strongly attract others
  7. 11. the reactants, products and catalyst exist in the same phase
  8. 13. unpaired electrons are attracted to a magnetic field
  9. 15. when outer electrons are repelled by core electrons
  10. 16. element characteristics have a tendency to repeat
  11. 17. paired electrons are repelled by a magnetic field