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प्रश्न
State the merits of Mendeleev's classification of elements.
उत्तर
The merits of Mendeleev's classification of elements:
1. Mendeleev's periodic law predicted the existence of certain elements such as gallium, scandium and germanium, which were not discovered at that time.
2. Mendeleev's periodic table could also predict the properties of various elements based on their position in the periodic table.
3. Mendeleev's periodic table could place group 18 elements, called Noble gases in the periodic table, when they were discovered.
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संबंधित प्रश्न
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminimum and eka-silicon. What names were given to these elements when they were discovered later on?
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?
Why did Mendeleev leave some gaps in his periodic table?
Which group of elements was missing from Mendeleev's original periodic table?
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.
(a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon
(b) Mention the period/periods of these elements in the modern periodic table.
(c) Write the group/ groups of these elements in the modern periodic table.
(d) Classify these elements as metals, non-metals or metalloids.
(e) How many valence electrons are present in the atoms of each of these elements?
State the merits of Mendeleev's classification of elements.
Write the name.
The family of elements having zero valency.
