A radioactive nucleus undergoes a series of decays according to the sequence X - X 1 - X 2 - X 3If the mass number and atomic number of X3 are 172 and 69 respectively- what is the mass number and atomic number of X-

The correct radioactive decay sequence will be as follows: _ 72 ^ #160; X ^ 180 β #160; _ 73 ^ #160; X _ 1 ^ 180 α #16 ...

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Alpha Decay

A radioactive...

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A radioactive nucleus undergoes a series of decays according to the sequence
$X β - --------- \to X_{1} α - ----------- \to X_{2} α - ----------- \to X_{3}$
If the mass number and atomic number of $X_{3}$ are $172$ and $69$ respectively, what is the mass number and atomic number of $X$ ?

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