The radius of nucleus of 27 13 Al will be :-
1] 1.2 x 10 ^ -15 m
2] 2.7 x 10 ^ - 15 m
3} 10. 8 x 10 ^-15 m
4] 4 x 10 ^-15 m
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Answer:2.7×10^-15 m
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