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Discussion

CBSE Preparation for classes 3rd to 10th
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The position of which of the elements in Mendeleev`s periodic table is controversial?

 
Hydrogen
Sulphur
Sodium
Aluminium

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Nivid Rakeshbhai Patel

Aluminium is placed prior to silicon, but this defies the law. As aluminium's weight is 29.98 where-areas silicon's weight is 28.09. Aluminium has more weight, but it is placed in the wrong place. Hydrogen's place is still a controversy as its similar to halogens and alkaline metals. So the answer is aluminium not hydrogen. Please change your answer.