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Limitations of Mendeleev's Periodic Table

Isotopes coul...

Question

Isotopes could find a position in Mendeleev's periodic table.

A

True

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B

False

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Solution

The correct option is B False
Mendeleev's periodic table failed because he couldn't tell about the position of isotopes, as he arranged elements on the basis of their increasing atomic mass.

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Q. Write a short note on the position of isotopes in the Mendeleev`s and the modern periodic table.

Q. Mendeleev arranged isotopes in horizontal rows in his periodic table.

Q. What are the limitations of Mendeleev's periodic table? How could the modern periodic table overcome the limitations of Mendeleev table?

Q. (a) Which two criteria did Mendeleev use to classify the elements in his periodic table?
(b) State Mendeleev's periodic law.
(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
(d) How and why does the atomic size vary as you go:
(i) from left to right along a period?
(ii) down a group?

Q. (a) How were the positions of isotopes of an element decided in the modern periodic table?
(b) How were the positions of cobalt and nickel resolved in the modern periodic table?
(c) where should hydrogen be placed in the modern periodic table? Give reason for your answer.

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Limitations of Mendeleev's Periodic Table

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