give three merits of mendeleev
Answers
Answer:
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. 3. He predicted the presence of three elements. They were named as Eka boron, Eka-aluminium and Eka-silicon.
Answer:
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Explanation:
Mendeleev’s periodic law and table is the first systematic attempt to classify elements on the fundamental property of the element/atom.
i) Give more weight to similarities in properties than to atomic mass in the arrangement. Iodine, though of smaller weight (127) than Tellurium (128) is placed later as it resembles more to chlorine and bromine than to oxygen and Sulphur. Similarly cobalt and nickel do not follow increasing atomic mass.
ii) Correction of atomic mass:
From the periodic properties, elements of beryllium, indium, gold and platinum were predicted to be having incorrect mass and lead to the re estimation of their real mass.
iii) Noble gases were discovered much later. Since they show inert behavior and zero valences, they could be easily attached to the Mendeleev’s table.