Atomic Mass

At one time, there was a atomic mass scale on the assignment of the value 16.0000 to naturally occuring oxygen. The atomic mass of silver on this scale will be (atomic masses of silver and oxygen on the present scale are 107.868 and 15.9994 respectively).

The atomic mass of thorium is 232 and its atomic number is 90. During the course of its radioactive disintegration 6 alpha and 4 beta particles are emitted. What is the atomic mass and atomic number of the atom?

According to the Thomsan model of an atom, mass of the atom is assumed to be