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Guess the atomic weight of middle el...

Guess the atomic weight of middle element if the atomic weights of first and last elements are 7 and 39 respectively according to Law to triaids.

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS -THE PERIODIC TABLE -CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION (SECTION -I)
  1. Give one example to Dobereiner's Triads .

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  2. Who classified elements as traids ?

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  3. Guess the atomic weight of middle element if the atomic weights ...

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  4. Who classified elements first ?

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  5. who proposed law of traids ?

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  6. Who proposed the law of octaves ?

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  7. Who classified elements by its atomic numbers first time ?

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  8. Whose periodical classification is similar to repetition of mus...

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  9. Who tried to classify the elements in terms of their common val...

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  10. "The law states hat the physical and chemical properties of the ...

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  11. Which property of an element taken for classification of elemen...

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  12. How many groups are there in mendeleev 's peridic table ?

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  13. How many periods are there in the mendeleev 's periodic table ?

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  14. Who was left the blanks in his periodic table for some undisc...

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  15. Write similar elements to eka-boron , eka aluminum and eka - sill...

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  16. "The placement of elements in Mendeleev 's periodic table helped ...

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  17. Equivalent weight xx valency =

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  18. The anomalous series of elements of mendeleev's periodic table ...

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  19. Name of the 101^(th ) element.

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  20. What is called by the number of postitive charges in an atom ?

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