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प्रश्न
Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.
उत्तर
Mendeleev laid the foundation for the modern periodic table by showing periodicity of the properties of the elements by arranging the elements (63) then known into 8 groups, by leaving gaps for undiscovered elements and predicting their properties. He made separate groups for metals and non-metals. He also created periods in which the element gradually changes from metallic to non-metallic character. He was also able to show that the element in the same sub-group had the same valency.
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संबंधित प्रश्न
Name three elements with filled outermost shells.
On what basis elements are arranged in periodi table now?
Use Mendeleev's Periodic Table to predict the formula of oxides of potassium, aluminum, and barium.
Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.
Write scientific reason.
There was no definitive place for isotope in Mendeleev’s periodic table.
On which basis Mendeleev organised periodic law?
What are the limitations of Mendeleev's periodic table?
In Mendeléev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later
On moving from left to right in a period in the periodic table, the size of the atom.
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
