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Q.

The element which has property (atomic mass) similar to those predicted by Mendeleev is:

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a

Gallium

b

Aluminium

c

Silicon

d

Manganese 

answer is A.

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Detailed Solution

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Gallium has properties (atomic mass) similar to those predicted by Mendeleev.
Mendeleev, in his periodic table, left a few gaps for the elements to be discovered in the future. He also predicted that the elements yet to be discovered will have properties similar to some already known elements. So, he tagged them with the term “Eka” which means similar. The element now known as Gallium was termed Eka-aluminium by Mendeleev as he predicted that Ga would show similar properties as Al.
 
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