Question

_______ was the basis of the classifications proposed by Dobereiner, Newlands and Mendeleeff.choose the correct answer from the bracket.( Na,(sodium),atomic mass,18th,(8viiiₐ),7th period,metaalic)

Answer 1

Atomic Mass was the basis of classification proposed by these scientists.

But , in 1913 Mosley proposed that the classification is based on atomic number, not atomic mass. And, it was accepted worldwide.



Hope it was helpful.

Answer 2

atomic mass was the basic of the classification proposed by dobereiner etc.