Compare Dobereiner’s triads to the modern periodic table. What aspects of his idea agreed with the modern table and what aspects did not

The aspects of Dobereiner’s triads that agreed with the modern table where elements were arranged together with similar properties, and the aspects that did not match were the periodic table arranged in the rising of their atomic number.

What were Dobereiner’s triads?

Dobereiner’s triads were the arrangement of chemical elements on the basis of their similar physical and chemical properties, this was called the old periodic table. It was given by German chemist Johan Wolfgang Dobereiner.

The modern periodic table is arranged on the basis of their atomic number The elements of Dobereiner's triads were placed based on the order of increasing atomic masses.

Thus, All known elements could not be grouped into triad groups based on their properties.

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Answer:

In  Dobereiner’s triads, elements were placed :

• According to increasing order of their atomic masses.
• Into groups which have similar chemical and physical properties.
• In each group there were three elements.

In Modern periodic table, elements are placed:

• According to increasing order of their atomic numbers.
• Into groups and these groups are assigned according to the numbers of valence electrons present in their valence shell.

Aspects of Dobereiner’s triads agreed with the modern periodic table

• Element of the same group will have similar chemical and physical properties.

Disagreement with the modern periodic table.

• Not all groups obeyed law of triads.
• On the basis of properties all known elements could not be classified into groups of triads.