Question

What are the achievements of medeleev's periodic table?

Answer 1

Answer:

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Achievements of Mendeleev’s Periodic Table :

1. Mendeleev sometimes placed an element with a slightly greater atomic mass before an element with a slightly lower atomic mass. The sequence was inverted so that elements with similar properties could be grouped together. Eg. Cobalt (atomic mass 58.9) appeared before Nickel (atomic mass 58.7).

2. Mendeleev left some gaps in his periodic table and boldly predicted the existence of some elements that had not been discovered at that time. E.g. Scandium, Gallium and

Germanium discovered later have properties similar to the elements predicted by Mendeleev as Eka-Boron, Eka-Aluminium and Eka-Silicon respectively.

3. One of the strengths of Mendeleev’s periodic table was that when noble gases were discovered, they could be placed in a new group without disturbing the existing order.

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Answer 2

Answer:

Achievements of Mendeleev's Periodic Table

Systematic study of the elements. ...

Prediction of new elements and their properties. ...

Correction of doubtful atomic masses. ...

Position of hydrogen. ...

Anomalous positions of some elements. ...

Position of isotopes. ...

No co-relation of elements in sub-groups. ...

Different groups for similar elements.

Explanation:

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