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प्रश्न
What name were given by Mendeleev to the then undiscovered element scandium.
उत्तर
Scandium (Sc) was known as eka-boron.
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संबंधित प्रश्न
The element eka-silicon in Mendeleev’s periodic table is known as ………… in the modern periodic table.
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
What property do all elements in the same column of the Periodic Table as fluorine have in common?
Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.
Describe two anomalies of Mendeleev's periodic classification of elements.
What name were given by Mendeleev to the then undiscovered element germanium?
How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
Why did Mendeleev leave some gaps in his periodic table?
An element X forms an oxide X2O3. In which group of Mendeleev's periodic table is this element placed?
(a) group II
(b) group III
(c) group V
(d) group VIII
Match the columns.
| Column A | Column B |
| 1) Triads | a) Mendeleev |
| 2) Octave | b) Dobereiner |
| 3) Atomic number | c) Thomson |
| 4) Atomic mass number | d) Moseley |
| e) Newland |
