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Limitations of Mendeleev's Periodic Table

Why wasn't hy...

Question

Why wasn't hydrogen given a fixed position in Mendeleev’s Periodic Table? [1 MARK]

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Solution

Explanation: 1 Mark
Hydrogen possessed characteristics that resemble both the alkali metals and the halogens.
So, it was placed above both the groups and could not be given a fixed position in Mendeleev’s Periodic Table.

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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?

Why did Mendeleev leave gaps in his periodic table? [2 MARKS]

Q. (a) In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
(b) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

The position of hydrogen in the modern periodic table is not fixed.

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

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Limitations of Mendeleev's Periodic Table

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