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The emission of penetraing alpha , betap...

The emission of penetraing `alpha , beta`particle `(""_(2) ^(4) He ` and `""_(-1)^(0)e` respectively ) along with `gamma`- radiation (hv) was noticed from unstable nuclei . All elements having `Z gt 82` show this phenomenon . The emission was explained in terms of low binding energy (giving `alpha`- decay) high n/p ratio (neutron decay) , `gamma` from a radioactive nuclide is secondary emission.
An element of group III with At. no. 90 and mass number of 238 undergoes decay of one `alpha`- particle . The newly formed element belongs to :

A

I

B

II

C

III

D

IV

Text Solution

Verified by Experts

The correct Answer is:
B
`""_(90) X^(238) (or) ""_(90) Th^(238) to ""_(2) He^(4) + ""_(88) Y^(234)`
`2 ( ""_(1) D^(2)) to 1 ( ""_(2) He^(4)) + Q , Q = ?`
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