Topic: Periodic Table of Elements

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Across
  1. 2. Element N is colourless. Element N is __________ (Ne).
  2. 4. Li is a symbol of __________.
  3. 5. Group 1 elements is good __________ agent.
  4. 8. __________ oxide not soluble in sodium hydroxide solution.
  5. 11. Alkaline solutions turn the __________ indicator red.
  6. 13. Silicon (V) oxide and phosphorus (V) oxide dissolve in sodium hydroxide because they have __________ properties.
  7. 14. Elements that have high densities, high tensile strength and high boiling points.
  8. 16. Group 17 elements has the ability to __________ electrons to achieve stability.
  9. 17. The modern Periodic Table consists of vertical __________ called groups.
  10. 18. Helium
  11. 19. Symbol of Radon is __________.
Down
  1. 1. All the elements in the modern Periodic Table are arranged in groups and __________.
  2. 3. Element P is placed in Group 1. Element P is __________ (Fr).
  3. 6. Measure of the strength of an atom of an element to attract electrons towards its nucleus.
  4. 7. The basic principle used in the arrangement of elements in the Periodic Table is __________ proton numbers.
  5. 8. All elements in Group 18 do not react with other elements or compound because they exist as __________.
  6. 9. Vanadium (V) oxide V2O2 is used as a catalyst in the production of __________ acid.
  7. 10. The excess of __________ have to be absorbed by soda lime as it is poisonous.
  8. 12. I.
  9. 15. In going down the group, the mass of the elements increases and leads to __________ van der Waals forces between the molecules.