Concept of Triads was introduced by:
Correct answer: A. Dobereiner
- A. Dobereiner
- B. Mendeleev
- C. Newlands
- D. Meyer
Explanation
Dobereiner observed that when elements are arranged in order of increasing atomic weight, every third element shows similar properties. He called these groups "triads." This concept, while ultimately replaced by Mendeleev's more comprehensive periodic table, provided early insights into the relationships between elements
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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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