Question

For the real or imaginary nucleus of ₈₇X²¹², find (a) the net electrical charge of the nucleus, (b) the number of neutrons, (c) the number of nucleons, (d) the approximate radius of the nucleus, and (e) the nuclear density.

Answer 1

1. The electric charge of neucleous is 87p. p is the unit charge of single proton.

2. The number of neutron is 212-87 = 125

3. The radius of neucleous =

R = 1.25x10^-15 *212 = 265 fm

4. Density = Total mass/ total volume =

Total mass = 125*mas sof neutron +87* mass of proton =

= 3.54884x10^{-25 kg}

^{Volume = =} 7.79 x10^-38

So density = M/V = 4.55 x10¹² kg/m3