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List any three observation which posed a challenge to mendeleev s periodic law?

Posted by Yash Mishra 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Khushi Rathore 5 years, 11 months ago

1.he would not describe the position of hydrogen 2 he arrange elements according to their atomic mass in increasing order but he place cobalt before Nickel where cobalt have high atomic mass as nickel

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??Geetha Sree ?? 5 years, 11 months ago

1. His table didn't have a particular position to hydrogen. 2. He arranged elements named Cobalt and Nickel in a twisted manner. He kept cobalt (atomic mass - 58.93) before nickel ( atomic mass - 58.71). 3. Another problem was that the atomic masses do not increase in a regular manner in going from one element to the next. So it was not possible to predict how many elements could be discovered between two elements - especially when we consider the heavier elements.

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