Early Attempts at the Classification of Elements
Early Attempts at the Classification of Elements: Overview
In this topic, we will learn about the early attempts of classification of elements. It also briefs on the Dobereiner's triads and Newlands law of octaves in detail.
Important Questions on Early Attempts at the Classification of Elements
Dobereiner could identify only three triads from the elements known at that time. One of them is:
Dobereiner could identify only three triads from the elements known at that time.
The Dobereiner's groups of elements are called_____.
Give an example of the Dobereiner triad.
What are the limitations of Dobereiner's Triads?
State Dobereiner's law of triads.
State "Newlands' Law of Octaves" for the classification of elements.
Name the chemist who gave triad rule for classification of elements.
On what basis Newland proposed his classification?
Give an example of Dobereiner's triad.
In Dobereiner's triads, the atomic weight of the middle element is the _____ of the atomic masses of and elements.
The 'Law of Octaves' was given by the scientist Lother Meyer
The arrangements of elements in a group of three is known as _____.
According to octaves rule when elements are arranged in the order of increasing atomic masses, the properties of the eight element (starting from a given element) are a repetition of the properties of the first element.
Example of Dobereiner's triad is:
Newlands' law of octaves seemed to be true only for elements up to . Here, A refers to
Among the following elements, _____ does not fit in Dobereiner's traid.
Up to which element, the law of octaves was found to be applicable?
One of the limitations of the Law of Octaves is that it was only applicable up to the atom _____.
Before the Modern Periodic Table was proposed and accepted there were numerous theories propounded and rejected. Most notable among them were those proposed by Mendeleev, Newland and Dobereiner.
Why did these theories fail?
