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OpenStudy (superhelp101):

When a radioactive isotope releases an alpha particle, the mass number of the atom is decreased by two. decreased by four. increased by two. increased by four.

OpenStudy (superhelp101):

@JoannaBlackwelder this is C right ?

OpenStudy (joannablackwelder):

I think when an isotope releases an alpha particle, that the mass would decrease by 2, not increase.

OpenStudy (superhelp101):

wait yes sorry that is what i meant!! opps again. thanks!

OpenStudy (joannablackwelder):

No worries :)

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