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प्रश्न
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?
उत्तर
(i) Eka-boron was named scandium (Sc).
(ii) Eka-aluminium was named gallium (Ga).
(iii) Eka- silicon was named germanium (Ge).
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संबंधित प्रश्न
Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.
What name were given by Mendeleev to the then undiscovered element scandium.
How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?
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.
The elements from the zero group are called _______.
Write the name.
The family of elements having zero valency.
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.)
Which one of the following does not increase while moving down the group of the periodic table?
