The Periodic Table

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Across
  1. 5. across each Period from left to right, atomic radius ___
  2. 7. Down Group I, melting and boiling points ___
  3. 8. Group I metals have ___ melting and boiling points
  4. 9. elements in the Periodic Table are arranged in order of increasing ___ or atomic number
  5. 11. Group I metals are ___ and can be cut by a knife
  6. 12. Down Group I, densities ___
  7. 13. down each Group, the number of electron shells increases, distance from nucleus to valence shell ___
  8. 14. Group I metals have low ____
  9. 15. elements in the same Group have the same number of ___ electrons
  10. 17. elements in the same ___ undergo similar chemical properties
  11. 18. a horizontal row of elements having the same number of electron shells
  12. 19. alkali metals in Group I have ___ valence electron
  13. 21. ___ is the least reactive metal in Group I
Down
  1. 1. effective nuclear charge ___ across the Period, causing valence electrons to be attracted more strongly
  2. 2. alkali metals react with water producing soluble metal hydroxides and ____ gas
  3. 3. across each Period, there is a ___ in metallic properties
  4. 4. Group I metals are the most metallic and hence the strongest ___ agents
  5. 6. halogens in Group VII have ___ valence electrons
  6. 10. ___ floats and darts about the surface of water, burning with a yellow orange flame
  7. 16. across each Period, the nature of oxides change from basic to ___ to acidic oxides
  8. 20. potassium produces a ___flame as it reacts with water