Question

where is the majority of the mass of the atom located?
a in the nucleus
b in the electron orbitals
c it is spread evenly throughout the atom
d mass concentration depends on the number of energy levels present

Explanation:

Atoms consist of a nucleus containing protons and neutrons, which have significant mass compared to electrons in electron - orbitals. The majority of an atom's mass is in the nucleus.

Answer:

A. In the nucleus