Question

List one advantage and one demerit of the early attempts made by Dobereiner, Newland and Medeleev in the making of the periodic table ...

Answer 1

Explanation:

Theories Advantage Limitation

Dobereiner’s triad It made chemist look at the elements as a group of elements having same physical and chemical properties He could identify only three triads from the elements known at that time. Hence, it was not useful.

Newland’s law of octaves First attempt to classify elements on the basis of the concept of atomic masses Law of octaves was applicable only up to calcium

Mendeleev's periodic table Mendeleev’s periodic table could predict errors in the atomic masses of certain elements. It did not provide clear structure of atom