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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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