The stable nucleus that has a radius `1//3` that of `Os^(189)` is-

Correct Answer - A
Radius of `Os^(189)=r_(0)A_(os)^(1//3)`
Radius of that nucleus `=(1)/(3)xxr_(0)(A_(o_(5)))(1)/(3)=r_(0)((189)/(27))^(1)/(3)=r_(0)7^(1//3)`
`:. A` for that nucleus `=7`

The stable nucleus that has a radius `1//3` that of `Os^(189)` is-

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