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A radioactive isotope decays by two α emissions followed by two β emissions. What is the...

A radioactive isotope decays by two α emissions 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 8 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 8 and the atomic number decreases by 2.

e. none of the above

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Answer #1

For emmission of alpha particle, atomic number decreased by 2 units and mass number decreased by 4 units. For 2 alpha particles it would be 4 and 8.

For beta emission, atomic number increases by 1 unit and there will not be any change in the mass number.

Therefore for your question, answer is the d option.

Thanks hope u got the answer. Please like it.

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