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(a) What was the basis of Mendeleev's Cl...

(a) What was the basis of Mendeleev's Classification of elements ?
(b) List two achievements of Mendeleev's periodic tables.
(c) List any two observations which posed a challenge to Mendeleev's periodic law.

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The physical and chemical properties of elements are periodic function of their atomic masses.
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ICSE-THE PERIODIC TABLE -TOPIC 1 Modern Periodic Table and its Periodicity (3 Marks Questions )
  1. How does number of Valence electrons on moving from left to right In...

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  2. How does number of valency vary on moving from left to right In the ...

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  3. What is meant by a group in the periodic table?

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  4. Explain why the elements of the same group exhibit the same chemical b...

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  5. In which Group the inert gases are placed in the periodic table ?

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  6. A part of the periodic table is shown below with one element missing :...

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  7. A part of the periodic table is shown below with one element missing :...

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  8. A part of the periodic table is shown below with one element missing :...

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  9. Name the element whose properties can be predicted on the basis of its...

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  10. (a) What was the basis of Mendeleev's Classification of elements ? (...

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  11. Predict the formula of hydrides of carbon and silicon using Mendeleev'...

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  12. Write three similarities between hydrogen & alkali metals.

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  13. In the table given below, fill the vacant places. {:("Elements","Hy...

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  14. The elements given below are arranged in order of increasing atomic ma...

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  15. The elements given below are arranged in order of increasing atomic ma...

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  16. What is the total no. of elements in shortest period of modern periodi...

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  17. What is the number of elements in: 1. 1^(st) period and 2. 2^(nd)...

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  18. Three elements of Dobereiner.s triad are X, Y & Z. If the atomic mass ...

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  19. Who proposed that atomic number is the fundamental property of an elem...

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  20. Newland's law of octaves states that

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