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The law of triads was proposed by

Correct answer: A. Dobereiner

  • A. Dobereiner
  • B. Newlands
  • C. Lothar Meyer
  • D. Chancourtois

Explanation

The correct answer is Dobereiner, who proposed the Law of Triads in the early 19th century. This was one of the first attempts to classify elements based on their chemical properties and atomic weights, grouping them into sets of three where the middle element had properties that were an average of the other two. The other options refer to different scientists who contributed to the development of the periodic table: Newlands with his Law of Octaves, Meyer with his atomic volume plots, and Chancourtois with his telluric helix.

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About Periodic Properties and Trends

Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.

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