State the merits of Mendeleev periodic table maintaining points of zero group and vacant space left for unknown elements
Answers
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1. He generalized the study of the elements then known as the study of a mere groups.
2. In Mendeleev’s periodic table, he left some blank spaces. These vacant spaces were left for including elements that were not discovered at that time.
3. Mendeleev could also predict the properties of these unknown elements, on the basis of the properties of the elements lying adjacent to these vacant spaces.
He predicted the presence of three elements. They were named as Eka boron, Eka-aluminium and Eka-silicon. The properties of these three elements were similar to the actual elements discovered later.
Eka-boron was similar to Scandium, Eka-aluminium was similar to Gallium and Eka-silicon was similar to Germanium.
4. When noble gases were discovered later, they could be accommodated in the periodic table in the form of a separate group without disturbing the positions of the other elements.
5. He was able to correct the values of the atomic masses of elements like gold and platinum, he placed these elements going strictly by the similarities in their properties
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it was in a table form helpful in organised studies
DEMERITS
it included elements with different properties in same group