Elements belonging to the same group have the same valency
Describe the merits of Mendeleev’s periodic table. Answer:- To give the proper place in the periodic table, atomic masses ofsome elements were revised in accordance with their properties. For example,the previously determined atomic mass of beryllium, 14.09, was changed to thecorrect value 9.4, and beryllium was placed before boron.(2) Mendeleev had kept some vacant places […]
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