What are the essential features of the p...

What are the essential features of the periodic table of Mendeleev? Discuss how his table has been modified subsequently.

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NCERT BANGLISH-PERIODIC CLASSIFICATION-I-Questions (Explain briefly the following)

Which of the following pairs of elements would have higher electron ga...
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Lanthanides and actinides are placed in separate rows at the bottom of...
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What do you mean by representative elements? Name the groups of the pe...
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Define transition elements. Name the different transition series.
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Which element of the following pairs have smaller ionization enthalpy?...
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Why is Na atom bigger than the atoms of both lithium and magnesium ?
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What do you mean by the term electron gain enthalpy? How does electron...
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Explain how the elements are arranged in the form of the periodic tabl...
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What are normal, transition and inner- transition elements?
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What are the differences between normal and transition elements?
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Explain why radii of positive ions are always smaller than the radii o...
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Explain the size of group Cl^(-1) gt Na^(+) .
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What is electron gain enthalpy? On what factors does it depend?
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Give the general variation of electron gain enthalpies in the periodic...
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Define the term ionic radius. Justify that the radius of anion is larg...
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What do you mean by ionization enthalpy? How does it vary across a per...
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What is meant by electronegativity? On what factors does it depend?
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What are the essential features of the periodic table of Mendeleev? Di...
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