Question

    Which radioactive element with atomic number 43 in the

    modern periodic table is unstable, and the half-lives of all its isotopes are relatively short, from 4.2 million years to 5.0 s?
    A Nobelium Correct Answer Incorrect Answer
    B Promethium Correct Answer Incorrect Answer
    C Neptunium Correct Answer Incorrect Answer
    D Technetium Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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