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प्रश्न
In Mendeléev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.
उत्तर
In Mendeleev′s periodic table there are instances where elements with higher atomic masses are placed before the element with lower atomic mass. This was done to ensure that elements with similar properties were included in the same group. Hence Cobalt was placed before Nickel despite the higher atomic number of Cobalt than Nickel.
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संबंधित प्रश्न
Write the merits of Mendeleev’s periodic table.
How many elements were known at the time of Mendeleev's classification of elements?
What are the demerits of Mendeleev’s periodic table?
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
In Mendeleev’s periodic table eka- silicon was later named as _______.
What challenges did Mendeleev face in following periodic law?
An element has 12 protons. The group and period to which this element belongs is ______
Which of the following statement (s) about the Modern Periodic Table are incorrect
- The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
- The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
- Isotopes are placed in adjoining group (s) in the Periodic Table
- The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
State Mendeleev’s Law of Periodicity.
