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प्रश्न
Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
उत्तर
Mendeleev's periodic law could not assign a fixed position to hydrogen in the periodic table because hydrogen resembled both alkali metals (Group 1) and halogens (Group 17) in some of its properties. Hydrogen reacts with metals to form ionic compounds called hydrides and also with non-metals to form covalent compounds.
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संबंधित प्रश्न
What were the criteria used by Mendeleev in creating his 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?
What name were given by Mendeleev to the then undiscovered element gallium?
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?
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?
Find the odd one out and give its explanation.
Write scientific reason.
In a group, the size of the atom increases as it goes down from the top.
Describe the merits of Mendeleev’s periodic table?
