7. X and Y are the two elements having similar properties which obey Newlands' law of octaves. How many
elements are there in-between X and Y ?
8. What was the Mendeleev's basis for the classification of elements ?
the then known elements. Mendeleev was guided by two factors. What are those two
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7. There are 7 other elements between them.( It can also be 15)
8. Mendeleev's basis of classification was atomic weight of respective then known elements.
[I actually dont know the second point of this ans.]
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