VARIATION IN PROPERTIES ACROSS PERIODS

VARIATION IN PROPERTIES ACROSS PERIODS 






Variation in the properties of elements left to right across period. A list of properties in a period along with their variation is provided as below-



  1.  Atomic Number – Increases
  2. Atomic weight – Generally Increases
  3. Nuclear charge – Increases
  4. Effective Nuclear charge – Generally Increases
  5. Atomic Radii – Generally decreases
  6. Ionic Radii – Generally decreases
  7. First Ionisation Energy - Generally increases
  8. Electron Affinity – Generally increases
  9. Atomic volume – Generally decreases
  10. Metallic character – Decreases
  11. Electron Negativity – Generally increases
  12. Reactivity of Metals – Generally decreases
  13. Reducing power of Metals – Generally decreases
  14. Volatility of Metals – Generally increases
  15. Lattice energy of Metals – Generally Increases
  16. M.P and B.P of Metals – Generally Increases
  17. Density of Metals – Generally Increases
  18. Basic Nature of Oxides – Decreases
  19. Basic Nature of Hydrides – Generally Decreases
  20. Basic Nature of Hydroxides – Generally Decreases
  21. Acidic Nature of Oxides – Increases
  22. Acidic Nature of Hydrides – Generally Increases
  23. Acidic Nature of Hydroxides – Generally increases
  24. Hydration Energy of Elements – Generally Increases
  25. Oxidising power of Non-Metals – Generally Increases
  26. Valency – From left to right across a period valency with respect to oxygen increases from 1 to 7, while that with respect to hydrogen rises from 1 to 4 and then fails to 1.

From These we can easily understand the properties of periodic classification.
I hope this will very helpful.


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