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What is the basic theme of organisation in the periodic table?

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The basic theme of organisation of elements in the periodic table is to classify the elements in periods and groups according to their properties. This arrangement makes the study of elements and their compounds simple and systematic. In the periodic table, elements with similar properties are placed in the same group.
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NCERT ENGLISH-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-All Questions
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  2. Show by a chemical reaction with water that Na(2)O is a basic oxide an...

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  3. What is the basic theme of organisation in the periodic table?

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

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  5. What is the basic difference in approach between the Mendeleev's perio...

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

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

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

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

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

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

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

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

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

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

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

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

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

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