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प्रश्न
What are the limitations of Mendeleev's periodic table?
उत्तर
- Elements with large difference in properties were included in the same group. Eg: Hard metals like copper (Cu) and silver (Ag) were included along with soft metals like sodium (Na) and potassium (K).
- No proper position could be given to the element hydrogen. Non-metallic hydrogen was placed along with metals like lithium (Li), sodium (Na) and potassium (K).
- The increasing order of atomic mass was not strictly followed throughout. Eg. Co & Ni, Te &I.
- No place for isotopes in the periodic table.
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संबंधित प्रश्न
On what basis elements are arranged in periodi table now?
Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
Why did Mendel choose garden pea for his experiments? Write two reasons.
Which group of elements was missing from Mendeleev's original periodic table?
Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.
Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?
Write scientific reason.
Mendeleev kept vacant places in the periodic table.
On which basis Mendeleev organised periodic law?
Which of the following oxide is most basic?
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
