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प्रश्न
Which group of elements was missing from Mendeleev's original periodic table?
उत्तर
Group 18 consisting of noble gases was missing from Mendeleev's original periodic table as the noble gases were not known at that time.
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संबंधित प्रश्न
What were the criteria used by Mendeleev in creating his Periodic Table?
Why do you think the noble gases are placed in a separate group?
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
An atom has electronic configurations 2, 8, 7.
What is the atomic number of this element?
State the merits of Mendeleev's classification of elements.
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of: ______
Find the odd one out and give its explanation.
Match the columns.
| Column A | Column B |
| 1) Eka-aluminium | a) Scandium |
| 2) Eka-Silicon | b) Gallium |
| 3) Eka- boron | c) Germanium |
| d) Beryllium |
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 |
