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Th^(234) disintergrates and emits 6beta-...

`Th^(234)` disintergrates and emits `6beta-` and `7alpha-` particles to form a stable product. Find the atomic number and mass number of the stable product and also identify the element.

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`._(90)^(234)Th rarr ``._(Z)A^(m) + 7 ``._(2)^(4) He + 6 ``._(-1)^(0)e`
Equating mass number : `234 = m + 28`
`:. M = 206`
Equating atomic number : `90 = Z + 14 - 6`
`:. Z = 82`
Thus element formed is `._(82)^(206)Pb`
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