Achievements of Mandeleev's periodic table :

1.	Achievements of Mandeleev's periodic table :
Answer» Answer: Prediction of UNKNOWN elements. Mendelèev left some spaces in his periodic table. Instead of looking at these spaces as defects, he predicted the existence of some elements that were not DISCOVERED at the time. He had predicted their CHEMICAL properties based on elements PRESENT in the same group as well.

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Answer:

Prediction of UNKNOWN elements.

Mendelèev left some spaces in his periodic table. Instead of looking at these spaces as defects, he predicted the existence of some elements that were not DISCOVERED at the time. He had predicted their CHEMICAL properties based on elements PRESENT in the same group as well.

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Achievements of Mandeleev's periodic table :​

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Achievements of Mandeleev's periodic table :