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प्रश्न
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
उत्तर
Scandium and germanium.
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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?
An atom has electronic configurations 2, 8, 7.
What is the atomic number of this element?
In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?
What name were given by Mendeleev to the then undiscovered element scandium.
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of: ______
State the merits of Mendeleev's classification of elements.
Find the odd one out and give its explanation.
An atom has electronic configurations 2, 8, 7.
To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
Match the column:
| Column ‘A’ | Column ‘B’ |
| Alkali metals | (a) Group 18 |
| Halogens | (b) Group 1 |
| Noble gases | (c) Group 17 |
