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प्रश्न
State the merits of Mendeleev's classification of elements.
उत्तर
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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संबंधित प्रश्न
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.
What property do all elements in the same column of the Periodic Table as fluorine have in common?
In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?
Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.
Why did Mendeleev leave some gaps in his periodic table?
Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
The elements from the zero group are called _______.
Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______
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 the name.
The family of elements having zero valency.
