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Why do elements in the same period have ...

Why do elements in the same period have different physical and chemical properties? What about elements in the same group?

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Elements in the same period have the same outermost shell for different outermost electronic configuration and hence have different physical and chemical properties. However, elements in the same group have similar outermost electronic configuration have similar physical and chemical properties.
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RESONANCE-PERIODIC TABLE & PERIODICITY-Board Level Exercise
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  6. In terms of block, period and group, where would you locate the elemen...

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  7. Write the general outer electronic configuration of s-,p-,d- and f-blo...

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  8. Use of Modern periodic table to answer the following questions: (i) ...

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  9. Explain why cations are smaller and anions larger in radii than their ...

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  10. Consider the following species: P^(3-), S^(2-), CI^(-), K^(+), Ca^(2+)...

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  11. Which of the following species will have the largest and the smallest ...

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  12. Energy of an electron in the ground state of the hydrogen atom is -5.1...

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  13. What are the various factors due to which the ionisation enthalpy of t...

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  14. The first ionization enthalpy (Delta(i)H) values of the second period ...

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  15. Would you expect the first ionisation enthalpies for two isotopes of t...

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  16. Would you expect the second electron gain enthalpy of S as positive, m...

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  17. What is the basic difference between the terms electron gain enthalpy ...

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  18. Using the Modern periodic table, predict the formules as compounds whi...

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  19. Which important property did Mendeleev use to classify the elements in...

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  20. On the basis of quantum numbers, justify that the fourth period of the...

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