Early Attempts at Classification of Elements
Early Attempts at Classification of Elements: Overview
Through this topic, we will know the early attempts at classification of elements. We will discuss Dobereiner's law of triads, along with its limitations. We will also come across the merits of Newland's classification.
Important Questions on Early Attempts at Classification of Elements
Arrange the following elements in the order of their increasing non-metallic character: Li, C, Be, F.
Dobereiner could identify only three triads from the elements known at that time. One of them is:
On what basis Newland proposed his classification?
Give an example of Dobereiner's triad.
Example of Dobereiner's triad is:
Newlands' law of octaves seemed to be true only for elements up to . Here, A refers to
Up to which element, the law of octaves was found to be applicable?
Which of the following set of elements belong to Dobereiner's triad?
Who proposed the law of octaves?
Which property of the middle element in a Dobereiner's triad was said to be the average of that of the first and the third element? (Atomic mass / Atomic number)
Newlands' arranged elements in periodic table based on their ___________________.
Read the given statements and mark the correct option.
Statement 1: According to Dobereiner, when the three similar elements are arranged in the order of their increasing atomic weights, the weight of the middle element is equal to the arithmetic mean of the other two elements.
Statement 2: Atomic mass unit is equal to one twelfth of mass of a carbon atom.
Who proposed the law of octaves?
According to Newlands law of octave which is the eighth element showing properties similar to that of beryllium:
Which of the following law was given by Newlands?
Which of the following statement is not true for Newlands law of octaves?
What are the limitations of Newlands' law of octave?
Which of the following are the limitations of Dobereiner Classification?
Dobereiner showed that when the three elements in a triad were written in the _____ order of atomic masses; the atomic mass of the middle element was roughly the ________ of the atomic masses of the other two elements.
____________ invented the system of classification into triads.
