How to place the ......... in Medeleev's periodic table was a major challenge.
1 noble gas
2 isotopes
3 halogen
4 radioactive
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3
Answer:
How to place the halogen in Medeleev's periodic table was a major challenge.
Answer: 3) Halogen
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Answer:
How to place the .Isotopes.. in Medeleev's periodic table was a major challenge.
Explanation:
Isotopes of elements were found which violated Mendeleev’s periodic law.
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