Question

Success of mEndeleev table

Answer 1

Answer:

Mendeleev could predict elements before they were discovered as eka boron, eka aluminum and eka silicon

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Answer 2

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The Achievements or the success of the Mendeleev's table are :-

• Systematic study of the elements : on the basis of i)increasing atomic masses and ii)grouping of similar elements together.

• Correction of doubtful atomic masses : example,Beryllium had 13.5 amu previously assumed mass but later 9 any was the correct one.

• Prediction of the new elements and their properties, example: Eka Boron- Scandium, Eka aluminium- Gallium and Eka Silicon- Germanium.

• Position of noble gases: The noble gases were not known when Mendeleev gave his periodic table. When these gases were discovered around the year 1900, they could be easily placed in a new group called zero group without disturbing the existing order.

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Mendeleev's periodic law :-

This law states that the physical and chemical properties of elements are periodic function of their atomic masses.

The repetition of properties of elements after certain regular intervals is called periodicty of properties.

The characteristic features of Mendeleev's periodic table :-

• Seven horizontal rows called periods
• 8 vertical columns called groups

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