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What is the basic difference in approach...

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

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According to Mendeleev.s periodic law, the physical and chemical properties of the elements are periodic function of their atomic weight. On the other hand, according to modern periodic law, the properties are periodic function of their atomic numbers.
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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -NCERT FILE (NCERT TEXTBOOK 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 Mendeleev's perio...

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

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  5. In terms of period and group where would you locate the element with Z...

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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 Ber...

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  8. Why do elements in the same period have different physical and chemica...

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

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  10. How do atomic radius generally vary in a period and in a group for s-a...

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

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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 ionization enthalpy values (in kJ mol^(-1)) of group 13 elem...

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

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