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Merits of Mendeleev's Periodic Table

Which of the ...

Question

Which of the following elements position's was not justified in Mendeleev's periodic table?

A

Hydrogen

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B

Lithium

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C

Sodium

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D

Potassium

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Solution

The correct option is A Hydrogen
The position of hydrogen was not justified in Mendeleev's periodic table. He positioned hydrogen in the first column above alkali metal. Hydrogen resembles not only alkali metals but also halogens in several ways. Hence, hydrogen can also be placed above the halogen group.

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Similar questions

Q. Which of the following element(s) was/were not known when Mendeleev gave his classification?

Q. Which of the following element(s) in the modern periodic table resemble elements predicted by Mendeleev?

(More than one option is correct)

Q. Consider the following statements:
(a) The discovery of inert gases later on did not disturb Mendeleev's arrangement.
(b) In his classification of element, Mendeleev was guided proportional to two factors.
(c) In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations.

Which of the above statement(s) is/are correct?

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Merits of Mendeleev's Periodic Table

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