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Q.

Mendeleev corrected the atomic weight of

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a

Os

b

all of the above

c

Be

d

In

 

answer is D.

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Detailed Solution

  • Mendeleev arranged the then known elements in increasing order of their atomic weight and observed the periodicity of properties of elements . 
  • Using the concept of valency he calculated atomic mass using the formula atomic mass =  equivalent weight × valency .
  • Thus he changed the atomic weights of Be, In and Os
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