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The first real breakthrough in the class...

The first real breakthrough in the classification of elements was provided by__________

A

Dmitri Ivanovich Mendeleev

B

Joham Dobereiner

C

Lothar Meyer

D

John Aiexander Newlands

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The correct Answer is:
A
Mendeleev was certainly the first to fully recognize the significance of priodicity in properties of elements when arranged in the order of increasing atomic masses.
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