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प्रश्न
State the contributions of Dimitri Mendeleev
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उत्तर
Dimitri Mendeleev
He formulated the – Periodic Table of elements.
1. He systematically arranged dozens of known elements by atomic weights and could even predict the properties of the still unknown elements.
2. He devised the Periodic Table. He was best known for his discovery of the – Periodic Law
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Give two examples of the following substance.
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