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Q.

By taking chemical properties in to consideration the atomic weights of the following elements were corrected

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a

$A r & K$

b

$T e & I$

c

$C o & N i$

d

$B e & I n$

answer is D.

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Detailed Solution

$B e & I n$ . At.Wt=equivalent wt×valency. Valency Be is corrected as 2 by Mendeleeve

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By taking chemical properties in to consideration the atomic weights of the following elements were corrected