Which of the following statements are true regarding Dobereiner's periodic table? Options: A . &nbsp The elements are written in the increasing order of atomic masses. B . &nbsp Similar elements occur after an interval of seven elements. C . &nbsp The mass of middle element was roughly the average of atomic masses of other two elements. D . &nbsp Elements in a triad show similar properties.

Which of the following statements are true regarding Dobereiner's periodi

Question

Which of the following statements are true regarding Dobereiner's periodic table?

Options:

A . The elements are written in the increasing order of atomic masses.

B . Similar elements occur after an interval of seven elements.

C . The mass of middle element was roughly the average of atomic masses of other two elements.

D . Elements in a triad show similar properties.

Answer: Option A
:
A, C, and D
Dobereiner stated that when elements with similar properties are arranged in a group of three (triad) in the increasing order of their atomic mass, the atomic mass of the middle element is roughly the average of the atomic masses of the other two elements.
However, similar elements occur at an interval of seven elements is one of the feature of Newland's octave.

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