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Three elements of Dobereiner.s triad are...

Three elements of Dobereiner.s triad are X, Y & Z. If the atomic mass of X is 7 and Z is 39,Calculate the atomic mass of Y.

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Atomic weight of A = 7
Atomic weight of C = 39
Atomic weight of B = `"Atomic weight of A + Atomic weight of C"/2`
`=(7+39)/2=23`
Atomic weight of B =23(average of weight of A & C)
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ICSE-THE PERIODIC TABLE -TOPIC 1 Modern Periodic Table and its Periodicity (2 Marks Questions )
  1. Why did Mendeleev left gaps in his periodic table ?

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

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  3. Provide reason for each of the following: Discarding the law of triad.

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  4. Did Dobereiner's triads also exist in the columns of Newlands' octaves...

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

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  6. The atomic number of an element is more important to the chemist than ...

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  7. Consider the following elements: Be, Li, Na, Ca,K. Name the elements o...

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  8. Consider the following elements: Be, Li, Na, Ca,K. Name the elements o...

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  9. State modern periodic law of classification of elements.

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  10. How many periods and groups are there in the modern periodic table ?

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  11. What is the main characteristic of the last elements in the periods of...

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

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  13. What is meant in the periodic table by a period ?

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  14. What is the number of elements in the 1^(st) period of the modern peri...

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  15. What is the number of elements in the 3^(rd) period of the modern peri...

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  16. Sodium and aluminium have atomic numbers 11 and 13, respectively. They...

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  17. Within a group where would you expect to find the element with (A) ...

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  18. Mention the part of group where the elements show: Big atomic size

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  19. The electronic configuration of element is ""35^17T is 2,8,7 Is it a...

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  20. Write electronic configuration of element underset(17)overset(35)""T....

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