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3 March, 11:00

What change in mass number occurs when a radioactive atom emits an alpha particle?

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  1. 3 March, 11:18
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    The alpha particle is the helium nucleus.

    The mass of helium nucleus (⁴₂He) is 4u.

    The mass of radioactive atom decreases by 4u. Look at the reaction below:

    ²²³₈₈Ra - - - > ⁴₂He + ²¹⁹₈₆Rn
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