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State the modern periodic law....

State the modern periodic law.

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Properties of elements are periodic functions of their atomic numbers.
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State modern periodic law and assign IUPAC name of element with atomic number 111.

a] Why are sodium and chlorine placed in the same period in the Modern Periodic Table? b] Why do elements placed in the same group of the periodic table have similar chemical properties? c] Who proposed the modern periodic law? On which fundamental property of an atom is it based?

Write the number of periods the modern periodic table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.

Which is the most electronegative element and the most electropositive element in the modern periodic table ?

Write the number of vertical columns in the modern periodic table. What are these columns called ?

Write the number of horizontal rows in the modern periodic table. What are these rows called ?

SUBHASH PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -THREE MARKS more than 3 marks
  1. State the modern periodic law.

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  2. Explain the features that influence/affect the ionization energy.

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  3. Explain classification of elements into different blocks in the period...

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  4. Explain the law of triads with example.

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  5. Briefly explain the account explain the account of groups and periods ...

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  6. Explain why size of anion is larger than parent atom.

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  7. Explain why size of cation is smaller than of the parent atom.

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  8. Explain the variation of radii of is electronic species or ions.

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  9. Why Fluorine atom has unexpectedly less negative Delta("eg") H than ch...

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  10. Explain periodicity of valence or oxidation state of s and p block ele...

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  11. Arrange the species in each group in order in increasing ionization en...

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  12. What are the factors that affect electron affinity ?

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  13. a. Explain why the second ionisation energy of B is significantly high...

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  14. a. Explain why the second ionisation energy of B is significantly high...

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  15. Why fluorine has lesser electron gain enthalpy than chlorine?

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  16. Give the reasons of the following : Noble gases tend to be less ...

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  17. Give the reasons of the following : First ionization enthalpy of ...

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  18. Account for the following : Mg^(+2) is smaller than O-^(2) ion al...

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  19. Account for the following : write the IUPAC name and the symbol fo...

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  20. Some elements are wrongly placed in the decreasing order of the prope...

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  21. Some elements are wrongly placed in the decreasing order of the prope...

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