1.

The radius of ""_(Z) M^(A) nucleus is (outer most configuration 3s^(2) 3p^(1) and A + Z = 40)

Answer»

4.2 FM
`1.4 XX root340 FM`
`1.4 xx ROOT2 40 FM`
`1.4 xx 40` F M

Solution :`r = r_0 (A^(1//3)) 1.4 xx (27)^(1//3) = 1.4 xx 3 = 4.2`


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