What relation about elements did dobereiner want to establish ?

What are elements?

What is an element?

What are the limitations of Dobereiner's law to triads ?

x,y and z are the elements of a Dobereiner 's tried .If the atomic mass of 'x' is 7 and that of 'z' in 39. what should be the atomic mass of the 'y' ?

Name the scientist who first gave a useful definition of element? How did he define an element?

Observe the following table and Fill it . Observations : Can you establish the same relationship with the set of elements given in the remaining rows ?

What important fact did Millikan's experiment establish ?

Chargaff did not establish that

What is diagonal relation? Give one pair of elements , that have this relation.

What is diagonal relation? Give one pair of elements, that have this relation.