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What is the mass number of the element produced when an element with mass number A emits an a ...

yxc47

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What is the mass number of the element produced when an element with mass number A emits an a ...

What is the mass number of the element produced when an element with mass number A emits an a particle?
A) A __ 4
B) A __ 2
C) A
D) A + 2

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Xuantunich

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Thanks

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