Question

what is the nuclear radius of an atom whose mass number is 125?

Answer 1

Radius of Nucleus is calculated using formula :-  R= R0A1/3  where R0 = 1.2 x 10-15m

Putting the value of A(mass number) in formula : R = 1.2 x 10-15m x (125)1/3 
                                                                                           = 1.2 x 10-15m x 5
                                                                                         =  6 x 10-15m​

Answer 2

Answer:The nuclear radius of an atom with mass number 125 is $6.0\times 10^{-15} m$.

Explanation:

Mass number of the atom = 125

Number of nucleons in an atom = 125

Radius of the nucleus =$R$

$R_o=1.2\times 10^{-15} m$ = constant value

$R=R_o\times A^{\frac{1}{3}}$

$R=1.2\times 10^{-15} m\times 125^{\frac{1}{3}}=1.2\times 10^{-15}\times 5=6.0\times 10^{-15} m$

The nuclear radius of an atom with mass number 125 is $6.0\times 10^{-15} m$.