Early Attempts at Classification of Elements

If the two members of the Dobereiner triads are calcium and strontium, the third member of the triad is

Up to which element was the Law of Octaves found to be applicable?

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?

Example of Dobereiner's triad is:

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?

How many elements were known when Newland gave this law? $\left(56/ 72/ 118\right)$

Name the scientists who gave us:
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)

The idea of telluric helix for arrangement of elements was given by _____. (Newlands / Chancourtois)

 The law of octaves was proposed by 

The ‘law of octaves’ was enunciated by:

Newlands proposed the law of _____ according to which eighth element, starting from a given one, is a kind of repetition of the first, like the eighth note of an octave in music.

Newlands' arranged elements in periodic table based on their ___________________.

Name the scientist who gave the Law of octaves?

Newland gave the law of octaves. The following questions are based on this law.
(i) How many elements were known at the time of Newland?

(ii) If one considered nitrogen as the first member of Newland’s octaves, then which element is present at the eighth position from it?

(iii) “Newland adjusted two dissimilar elements under the same slot”. Comment on this statement.

What was the major drawback of Newland’s law?