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प्रश्न
State the merits of Mendeleev's classification of elements.
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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
The element eka-silicon in Mendeleev’s periodic table is known as ………… in the modern periodic table.
What property do all elements in the same column of the Periodic Table as fluorine have in common?
Describe two anomalies of Mendeleev's periodic classification of elements.
What name were given by Mendeleev to the then undiscovered element scandium.
State any three limitations of Mnedeleev's classification of elements.
In Mendeleev's periodic table, gaps were left for the elements to be discovered later on. An element which found a vacant place in the periodic table later on is:
(a) Be
(b) Si
(c) Ge
(d) Se
Find the odd one out and give its explanation.
Write the name.
The family of elements having zero valency.
Describe the merits of Mendeleev’s periodic table?
Match the column:
| Column ‘A’ | Column ‘B’ |
| Alkali metals | (a) Group 18 |
| Halogens | (b) Group 1 |
| Noble gases | (c) Group 17 |
