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Q.

The atomic mass of Be is corrected by Mendeleev’s as:

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a

2

b

10

c

9

d

5

answer is A.

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Detailed Solution

Concept: Mendeleev for the first time arranged a very large number of the elements into groups and periods. This made the study of the elements quite systematic.

Mendeleev for the first time arranged a very large number of the elements into groups and periods. This made the study of the elements quite systematic.

He corrected the atomic mass of Be from 13.5 to 9.


 

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