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HELP PLEASE I DONT KNOW WHAT THIS MEANS IM CONFUSED

HELP PLEASE I DONT KNOW WHAT THIS MEANS IM CONFUSED-example-1
User Kyre
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Step-by-step explanation:

In an alpha emission, an alpha particle is ejected from a large nucleus. An alpha particle is simply a helium nucleus (atomic number is 2 and mass number is 4) so that means that the atomic number of the emitting nucleus decreases by 2 and its mass number decreases by 4.

User Niroshan Ratnayake
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