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An alkaline earth metal is radioactive. ...

An alkaline earth metal is radioactive. It and its daughter element decay by emitting 3 `alpha`- particles in succession. In what group should the resulting element be formed?

Text Solution

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`beta^(o+)`-emitter `(._(+1)e^(0))`, the atomic number decrease by 1
`._(a)X^(b) rarr ._(a - 1)Y^(b) + ._(+1)e^(0)`
Resulting element will be a noble gas (group 18).
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