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After the emission of an alpha - particl...

After the emission of an `alpha` - particle from the atom `""_(92)^(238) X` , the number of neutrons in the atom will be xyz , Y is___

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`""_(92) X^(238) to ""_(2) He^(4) + ""_(90) Y^(234) , N = 234 - 90 = 144`
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