Jmartinez7254 Jmartinez7254
  • 30-08-2017
  • Chemistry
contestada

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

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LeChatNoir
LeChatNoir LeChatNoir
  • 30-08-2017
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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