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What is the basic difference in approach...

What is the basic difference in approach between the Mendellev's peridic law and the Modern periodic law?

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Mendeleev’s Periodic Law states that the physical and chemical properties of elements are periodic functions of their atomic weights. On the other hand, the Modern periodic Law states that the physical and chemical properties of elements are periodic functions of their atomic numbers.
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NCERT-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-EXERCISE
  1. What is the basic theme of organisation in the periodic table?

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

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  3. What is the basic difference in approach between the Mendellev's perid...

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  4. On the basis of quantum number, which period of the periodic table sho...

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  5. In terms of block, period and group, where would you locate the elemen...

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  6. Write the atomic number of the element present in the third period and...

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  7. Which element do you think would have been named by (a) Lawrence Berke...

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  8. Why do elements with similar properties occur in the same group?

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  9. What do atomic radius and ionic radius really mean to you?

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  10. How do atomic radii vary (a) down the group and (b) along the period f...

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  11. What do you understand by isoelectronic species? Name a species that w...

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  12. Consider the following species: N^(3-),O^(2-),F^(ө),Na^(o+),Mg^(2+) ...

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

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  14. What is the significance of the terms-'isolated gaseous atom' and 'gro...

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  15. Energy of an electron in the ground state of the hydrogen atom is -2.1...

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  16. Among the second period elements the actual ionisation enthalpies are ...

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  17. How would you explain the fact that the first ionisation enthalpy of s...

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

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  19. The first ionisation enthalpy of group 13 elements are : Explain ...

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  20. Which of the following pairs of elements would have a more negative el...

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