Who introduced the term 'triads' in the classification of elements?
Johann Dobereiner
The correct answer is Johann Dobereiner.
Johann Dobereiner, a German chemist, is credited with introducing the concept of 'triads' in the early 1800s. His work focused on grouping elements with similar chemical properties into sets of three, called triads. Within each triad, the atomic weight of the middle element was approximately the average of the atomic weights of the other two elements. While this system was limited in scope and didn't encompass all elements, it represented a significant early attempt to organize and classify elements based on their properties, paving the way for later, more comprehensive periodic systems.
Other scientists like Newlands (Law of Octaves), Mendeleev (Periodic Table), and Chancourtois (Telluric Screw) also contributed to the development of periodic classification, but it was Dobereiner who first proposed the concept of triads.
Important Questions from Periodic Classification
Element X forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of periodic table as
- Which of the following statements is NOT correct with reference to the p-block elements?
- Where did Mendeleev arrange the elements in the periodic table with similar properties?
- What was the unknown element under aluminium called?
- What is another name for representative elements?
