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प्रश्न
Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.
उत्तर
Noble gases are the group of elements which could be placed in Mendeleev's periodic table later on, without disturbing the order. This is because they are inert (unreactive) elements, as their valence shells are completely filled with electrons. Therefore, Mendeleev decided to include these elements in a separate group.
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संबंधित प्रश्न
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
Why do you think the noble gases are placed in a separate group?
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.
In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?
Describe two anomalies of Mendeleev's periodic classification of elements.
What name were given by Mendeleev to the then undiscovered element germanium?
Why did Mendeleev leave some gaps in his periodic table?
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
State the merits of Mendeleev's classification of elements.
Write the name.
The family of elements having zero valency.
