Question

For which element atomic weight was correc-
ted by Mendeleev?
O
Ga
O
B.
O
In
O O
Ag​

Answer 1

Os is the answer .

Explanation:

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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