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प्रश्न
What was the Mendeleev's basis for the classification of elements?
उत्तर १
The atomic mass was Mendeleev's basis for the classification of elements.
उत्तर २
The atomic mass was Mendeleev's basis for the classification of elements.
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संबंधित प्रश्न
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.
Why did Mendeleev leave some gaps in his periodic table?
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?
State the merits of Mendeleev's classification of elements.
Find the odd one out and give its explanation.
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.
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.)
