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1. Name three obstacles that Mendeleev faced in his life? ​

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Answer:

was difficult to place isotopes of elements as they have the same chemical properties but different atomic masses. It was not possible to predict how many elements could be discovered between two heavy elements as the rise in atomic mass is not uniform.

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The  three obstacles that Mendeleev faced in his life include the following:

  • He found it difficult to place isotopes of elements in a group  
  • He found it difficult to fit some elements in the periodic table.
  • He had marital problems which made him practice bigamy.

Who was Mendeleev?

Mendeleev was of Russian region and was instrumental in the formation of

the periodic law and table. He faced several challenges such as marital

issues and also in the formulation of the periodic table as it became

ambiguous for him.

He couldn't fit in some elements on the table due to differences in the order

of atomic masses .

Read more about Mendeleev here https://brainly.com/question/11286917

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