A Radioactive Isotope Decays by α Emission Followed by Two

question 7

Multiple Choice

A radioactive isotope decays by α emission followed by two β emissions.What is the change in the mass number and atomic number of the original isotope?

• A)The mass number decreases by 4 and the atomic number is unchanged.
• B)The mass number increases by 4 and the atomic number increases by 2.
• C)The mass number increases by 4 and the atomic number increases by 4.
• D)The mass number decreases by 2 and the atomic number decreases by 2.
• E)none of the above

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