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Elements have been arranged in the follo...

Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl,Ar, K.
(a) Pick two sets of elements which have similar properties
(b) The given sequence represents which law of classification of elements ?

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(a) (i) F and Cl
(ii) Na and K
(b) Newlands. Law of Octaves
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VK GLOBAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -SHORT ANSWER QUESTIONS-I
  1. The three elements A, B and C with similar properties have atomic mass...

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  2. Elements have been arranged in the following sequence on the basis of ...

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  3. Why did Mendeleev leave some gaps in his Periodic Table?

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  4. State Periodic Law on which the Modern Periodic Table is based.

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  5. What do you understand by the term periodicity? Does the periodicity i...

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  6. What does each group in the Periodic Table signify?

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  7. Why do elements in any given group have similar properties?

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  8. Why do group 1 elements form unipositive ions?

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  9. Why are the elements of group 18 called zero valent?

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  10. Why group 17 elements form uninegative anions?

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  11. Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in diffe...

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  12. How does the metallic character change along the period?

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  13. What is atomic radius? Why does atomic radius decrease across a period...

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  14. Why does the size of the atom increase down the group?

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  15. Can the following groups of elements be classified as Dobereiner's tri...

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  16. Write the formulae of chlorides of Eka-Silicon and Eka-aluminium, the ...

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  17. If an element X is placed in group 14, what will be the formula and th...

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  18. Arrangement the following elements in increasing order of their atomic...

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  19. Identify and name the metal out of the following elements whose electr...

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  20. Arrange the following elements in the increasing order of their metall...

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