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.
Do you think Newland's law of octaves is correct? Justify.
Do you know why Newlands proposed the law of octaves? Explain your answer in terms of the modern structure of the atom.
What relation about elements did Dobereiner want to establish?
Newlands proposed the law of octaves. Mendeleev's suggested eight groups for elements in his table. How do you explain these observations in terms of modern periodic classification?
Lithium, _____ and potassium constitute a 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:
