Question

Triads rule was given by:

• A. Rutherford
• B. Dobereiner
• C. New Lands
• D. Rutherford and New Land

Hint:

The Triads Rule was an early attempt to classify elements based on their properties and atomic masses. It was proposed by Johann Wolfgang Döbereiner, who grouped elements into triads with similar chemical properties. This laid the groundwork for later periodic classification systems.

Answer 1

The Correct Option is B

Step 1: Understand the Triads Rule. The Triads Rule is a concept in chemistry that was proposed by Johann Wolfgang Döbereiner in the early 19th century. Döbereiner observed that certain elements could be grouped into triads of three elements with similar properties, where the atomic mass of the middle element in each triad was approximately the average of the atomic masses of the other two elements. Step 2: Analyze Each Option.
Option (1): Rutherford — Incorrect, as Rutherford is known for his work on atomic structure, not the Triads Rule.
Option (2): Dobereiner — Correct, as Döbereiner is credited with proposing the Triads Rule.
Option (3): New Lands — Incorrect, as this is not a recognized name associated with the Triads Rule.
Option (4): Rutherford and New Land — Incorrect, as neither Rutherford nor "New Land" is associated with the Triads Rule. Step 3: Final Answer. $$ (2) \mathbf{\text{Dobereiner}} $$