CBSE Class 10 Chemistry Classification Early Attempts

Q.

What should be the atomic mass of the middle element of a Dobereiner's triad if the other two elements have atomic masses 7 and 39? 



Q.

The unknown element of Mendeleev's periodic table eka-boron was later named  



Q.

Which element was not predicted by Mendeleev before its discovery?



Periodic Classification of Elements - Exam Decoded - 1

Study of early attempts of classification, Mendeleev's periodic table-Achievements and limitations

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.