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An element .(Z)M^(A) undergoes an alpha-...

An element `._(Z)M^(A)` undergoes an `alpha-` emission followed by two successive `beta-` emissions. The element formed is `………………………..` .

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`._(Z)M^(A)overset(-alpha)rarr._(z-2)M^(Z-4)``overset(-beta)rarr._(Z-1)M^(A-4)overset(-beta)rarr._(Z)M^(A-4)`
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