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     EduGorilla 
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    Which of the following statements is correct?

    Options :-

    1. -radioactivity is a process in which an electron is emitted from an unstable atom, whose atomic number Z remains unchanged.
    2. -radioactivity is the process in which daughter nucleus has atomic number 1 unit more than that of parent nucleus.
    3. -radioactivity is the process in which an unstable atom emits a helium nucleus.
    4. -radioactivity is the process in which a heavy atom emits electromagnetic radiation of very high frequency.
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