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X and Y are the two elements having simi...

`X` and `Y` are the two elements having similar properties which obey Newland's law of octaves. How many elements are there in between `X` and `Y`?

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The correct Answer is:
Six elements
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Triads And Law Of Octaves

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  2. A,B and C are the elements of a Deobereiner's triad. If th atomic mass...

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  3. X and Y are the two elements having similar properties which obey Newl...

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  4. What was the Mendeleev's basis of the classification of elements.?

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  5. In the classificatioin of the then known elements, Mendeleev was guide...

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  6. Name two elements whose properties were predicted on the basis of thei...

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  7. The three elements predicted by Mendeleev from the gaps in his periodi...

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  8. Name two elements whose properties were predicted on the basis of thei...

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  9. A,B and C are the elements of a Deobereiner's triad. If th atomic mass...

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  10. Which group of elements could be placed in mendeleev's periodic table ...

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  11. Fill in the following blanks with suitable words: (a) The basis for...

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  12. (a) What is meant by (i) a group and (ii) a period in a periodic table...

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  13. NEWLAND'S LAW OF OCTAVES

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  14. (a) State the merits of Mendeleev's classification of elements. (b) ...

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  15. (a) How do the properties of eka-aluminium element predicted by Mendel...

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  16. (a) Why do we classify elements? (b) What were the two criteria used...

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  17. In Mendeleev's periodic table gap was not left for one of the followin...

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  18. The Newlands' law of octaves for the classification of elements was fo...

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  19. According to Mendeleev' periodic law, the elements were arranged in th...

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  20. Three elements B, Si and Ge are :

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