Question

the modern periodic table has been evolved through the early attempts of the Dobereiner ,Newland and Mendeleev . List one limitation of all the three attempts.​

Answer 1

Answer:

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

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