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Question
State the merits of Mendeleev's classification of elements.
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Solution
Merits of Mendeleev's classification of elements:
- Grouping of elements
- Gaps for undiscovered elements: Mendeleev left some gaps in his periodic table for subsequent inclusion of elements not known at that time.
- He predicted the properties of the then-unknown elements on the basis of properties of elements lying adjacent to the vacant slots (eka-aluminum and eka-silicon).
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RELATED QUESTIONS
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.
Name two elements whose properties were predicted on the basis fo their positions in Mendeleev's periodic table.
State the periodic law on which Mendeleev's periodic table table was based. Why and how was this periodic law changed?
Describe two anomalies of Mendeleev's periodic classification of elements.
What name were given by Mendeleev to the then undiscovered element scandium.
What name were given by Mendeleev to the then undiscovered element gallium?
How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
Find the correlation:
Eka boron : Scandium : : Eka Aluminum : ______
Match the columns.
| Column A | Column B |
| 1) Eka-aluminium | a) Scandium |
| 2) Eka-Silicon | b) Gallium |
| 3) Eka-boron | c) Germanium |
| d) Beryllium |
Write a scientific reason.
In a group, the size of the atom increases as it goes down from the top.
