Why was the basis of classification of e...

Why was the basis of classification of elements changed from atomic mass to atomk number ?

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-REVIEW EXERCISES

Which of the following pairs of elements were found anomalous in Mende...
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Which of the following pairs of elements were found anomalous in Mende...
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Why was the basis of classification of elements changed from atomic ma...
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In what manner is the long form of periodic table better than Mendele...
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Write the electronic configuration of the following elements and predi...
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Write the electronic configuration of the following elements and predi...
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Write the electronic configuration of the following elements and predi...
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Write the electronic configuration of the following elements and predi...
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Write the electronic configuration of the following elements and predi...
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Classify the following elements into the types and the blocks to which...
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Which of the following radii of an atom is the smallest and why? Cov...
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Which of the following pairs are isoelectronic ? Na, Mg
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Which of the following pairs are isoelectronic ? F^(-),O^(2-)
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Which of the following pairs are isoelectronic ? K^(+),Sc^(3+)
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The ionisation energy of H is 1312 kJ mol^(- 1). How much energy is re...
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It requires 2.378xx10^(7)J energy to ionise a certain amount of helium...
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Which element in each of the following pairs would you expect to have ...
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Which element in each of the following pairs would you expect to have ...
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Which element in each of the following pairs would you expect to have ...
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A, B, C and D are four elements with atomic numbers Z - 1, Z, Z + 1 an...
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