Where is the mass of an atom concentrated?

The mass of an atom is

Assertion:The whole mass of the atom is concentrated in the nucleus. Reason:The whole mass of the atom is concentrated in the nucleus Reason:The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it.

(A) most of the mass of the atom is concentrated in its nucleus. (R) all alpha particles striking a gold sheet are scattered in different directions.

Atomic nucleus is central core of every atom in which the whole of positive charge and almost entire mass of atom is concentrated. It is a tiny sphere of a radius R is given by R=R_(o)A^(1//3) , where R_(o)=1.4xx10^(-15)m , a constant and A the mass number of nucleus The radius of the nucleus of mass number 125 is

Atomic nucleus is central core of every atom in which the whole of positive charge and almost entire mass of atom is concentrated. It is a tiny sphere of a radius R is given by R=R_(o)A^(1//3) , where R_(o)=1.4xx10^(-15)m , a constant and A the mass number of nucleus On increasing the value of 'A' the density of the nucleus

Atomic nucleus is central core of every atom in which the whole of positive charge and almost entire mass of atom is concentrated. It is a tiny sphere of a radius R is given by R=R_(o)A^(1//3) , where R_(o)=1.4xx10^(-15)m , a constant and A the mass number of nucleus A graph between 'log((R )/(R_(0))) , and 'logA'