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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
What were the criteria used by Mendeleev in creating his Periodic Table?
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
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.
What property do all elements in the same column of the Periodic Table as boron have in common?
In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?
In Mendeleev's periodic table, gap was not left for one of the following elements. This element is:
(a) gallium
(b) beryllium
(c) germanium
(d) scandium
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of: ______
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.
(a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon
(b) Mention the period/periods of these elements in the modern periodic table.
(c) Write the group/ groups of these elements in the modern periodic table.
(d) Classify these elements as metals, non-metals or metalloids.
(e) How many valence electrons are present in the atoms of each of these elements?
Eka boron : Scandium : : Eka Aluminum : _______
Find the odd one out and give its explanation.
