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The three elements A, B and C with simil...

The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. This mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as ? Give on example of such a set of elements.

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The arrangement of these elements is known as Dobereiner triad. Example: lithium, sodium and potassium.
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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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