Question

Where is most of the mass of an atom located? in the nucleus in the orbits in the electrons it is split between the nucleus and the orbits

Answer 1

Most of the mass is located in the nucleus as suggested by Rutherford's gold foil experiment.

Answer 2

in the nucleus

Step-by-step explanation:

The majority of mass of an atom consists in the nucleus which consists of protons and neutrons. The mass of a proton is 1.6726219 × 10⁻²⁷ kilograms and the mass of neutron is 1.674929 x 10⁻²⁷ kg while the mass of an electron is 9.109390 x 10⁻³¹ kg.

As it can be seen that the masses of both the protons and neutrons are higher than that of an electron the most mass lies in the nucleus.