![]() Initially, there was no theoretical explanation for the Periodic Law, and it was only used as an empirical principle however, with the development of quantum mechanics, it became possible to understand the theoretical basis for the Periodic Law. Lothar Meyer presented his table following Mendeleev, but he disagreed with Mendeleev’s Periodic law. Henry Moseley discovered in 1913 that periodicity is determined by the atomic number rather than the atomic weight. So, he arranged them according to increasing atomic. Mendeleev also proposed an elemental periodic system based not only on atomic weights but also on the chemical and physical properties of the elements and their compounds. This order did not fit the trends in physical and chemical characteristics of the elements that he expected. Mendeleev discovered this principle in 1871, following a number of investigations throughout the nineteenth century. ISRO CS Syllabus for Scientist/Engineer Exam.Example 1 The atoms of the elements get largeras you go down the group. The example below is about the question of why Group 1 elements get more reactive asyou go down the group. ISRO CS Original Papers and Official Keys Trends in reactivity in the Periodic Table Flow charts are sometimes a good way to organise your thoughts into a line of reasoning or logicalargument.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.Python Backend Development with Django(Live).Android App Development with Kotlin(Live).Full Stack Development with React & Node JS(Live) Covalent or atomic radius increases going down a group of the periodic table as there are more electron shells in atoms.Java Programming - Beginner to Advanced.Data Structure & Algorithm-Self Paced(C++/JAVA).Data Structures & Algorithms in JavaScript.Data Structure & Algorithm Classes (Live).
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