Basic Chemistry Puzzle

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Across
  1. 2. .......... rows in the periodic table are Periods.
  2. 3. Two adjacent H2O (water) molecules can form a linkage known as a ....... bond when they polarize.
  3. 7. ........elements included the elements of group 1 and group 2 of the periodic table.
  4. 9. K is the chemical symbol of .....
  5. 10. In Periodic table vertical columns are called ......
Down
  1. 1. .......is present in lemon.
  2. 4. .....salt is Calcium sulphate.
  3. 5. Unreactive non-metals are .......
  4. 6. have a pH level below 7.
  5. 8. is the fourth most abundant element in the universe in terms of mass.