a hydrogen nucleus and a nucleus of a unknown atom are stationary, 5.0x10^-10 m apart. the mass of the hydrogen necleus mh= 1.7x10^-27 kg and the electric charge of the hydrogen nucleus is e=1.6x10^-19 C. you may assume that the columb constant ke= 9.0x10^9 Nm2 C-2 and the gravitational constant G=6.7x10^-11 Nm2 kg-2.

the magnitude of the electrical force betwwen the hydrogen nucleus and the unknown nucleus is 5.5x10^-9 N. state wether this force is attractive or repulsive. calculate the electric charge on the unknown nucleus that is necessary to give a force of this magnitude. express your answer in columbs using scientic notation.

any help here would be really helpful