Question

describe the achievement of mendeleev's periodic table give me answer in lengthy ​

Answer 1

Answer:

before an element with a slightly lower atomic mass with an inverted sequence so as to group the elements with similar properties. ... existence of some elements that were not discovered at that time. He named the future elements by prefixing a Sanskrit numeral, Eka (one) to the name of preceding element in the same group

Answer 2

Answer:

I hope this will help

Explanation:

The achievements by Mendeleev were:

Mendeleev kept some blank spaces in the periodic for the elements that were yet to be discovered.

E.g. :- Eka-aluminium , Eka-boron, Eka-silicon

He also predicted of some elements which were yet to be discovered.

E.g:- The properties of Eka-aluminium predicted by Mendeleev and those of element gallium were almost the same .

Property Eka-aluminiumGalliumAtomic mass6869.7Formula of oxideE2O3

Ga2O3Formula of chloride ECl3GaCl3When noble gases were discovered, they could be placed in a new group without disturbing the order.

The formula of the hybrides and oxides formed by an element were treated as one of the basic the properties of an element for its classification.

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yash kanojia..!