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LenaWriter [7]
3 years ago
10

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

Chemistry
1 answer:
Alik [6]3 years ago
6 0
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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3 years ago
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