Concept of Triads was introduced by_______________?
Correct answer: A. Dobereiner
- A. Dobereiner
- B. Newland
- C. Mendeleev
- D. Al-Razi
Explanation
Johann Wolfgang Döbereiner introduced the concept of triads, grouping three elements with similar properties in which the atomic mass of the middle element was approximately the average of the other two. Students often choose Mendeleev because he developed an important periodic table, but the triad classification came earlier from Döbereiner.
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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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