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Mendeleev's Periodic Law

The position ...

Question

The position of hydrogen atom was unclear in Mendeleev's periodic table.

A

True

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B

False

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Solution

The correct option is A True

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

The modern periodic table was prepared by :

(a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

Q. Assertion (X): Mendeleev placed Co before Ni in the periodic table by violating the trend of increasing atomic mass

Reason (Y): The sequence was inverted to group the elements with similar properties together

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?

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Mendeleev's Periodic Law

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