Question asked by Filo student

Merits of Mendelect's periadic tahie Serence is progressive. There is a freedom in science to revise the old inferense h Gassigg mase advanced means and methods of doing experiments. These characteristics sckerses are clearly seen in the Mendeleev's periodic table, Whale applying the law that the properties of elements are a periodie function of thes awmic masses, to alf the known clements, Mendeleev arranged the clements with a thought that the information available till then was not finai bur it could change. As a Resuit of flis: Mendelcex"s periodie table demonstrates the following merits. 1. Lromic nasses of some elemenis were revised so as fo give them proper place in th periocie table in aceordance with their properties. For example, the previously determine atomic mass of beryllium, 14.09, was changed to the carrect value $9.4$, and heryllium wat piaced befare boront 2. Mendelecy kept vacant places in the periodie table for elements not discovered in then. Threeg of these unknown elements were given the nameseka-boroni gka giuminsin and eka-sticam from the known neighbours and their atomic moses were indicated o 44. 68 and 72 respectively. Not only this but their properties were alse predicted. Late on these elements frgre, disceyered and named as scandium (Sc), gatliam (Cio) an: gemiantum fGe) respectively the properties of these elements matehed well with thoses mredicted by Mendeleev. See table 24 . Due to this success all were conviliced about the importance of Mendeleev's periodic table and this method of classification of elemen was acecpied immediotely

Views: 5,672 students

Updated on: Sep 2, 2022