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प्रश्न
Why did Mendeleev leave some gaps in his periodic table?
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उत्तर
Mendeleev left some gaps in his periodic table for the elements which were not known at that time, to ascertain that elements having the same properties fell in the same vertical column or group, without disturbing the arrangement of previous elements.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
