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प्रश्न
In Mendeleev's periodic table, gaps were left for the elements to be discovered later on. An element which found a vacant place in the periodic table later on is:
(a) Be
(b) Si
(c) Ge
(d) Se
उत्तर
(c) Ge.
Germanium (eka- silicon) is the element which found a vacant place in the periodic table later on.
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संबंधित प्रश्न
Why do you think the noble gases are placed in a separate group?
What property do all elements in the same column of the Periodic Table as boron have in common?
What property do all elements in the same column of the Periodic Table as fluorine have in common?
An atom has electronic configurations 2, 8, 7.
What is the atomic number of this element?
What name were given by Mendeleev to the then undiscovered element scandium.
Why did Mendeleev leave some gaps in his periodic table?
Which group of elements was missing from Mendeleev's original 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?
Find the odd one out and give its explanation.
Describe the merits of Mendeleev’s periodic table?
