A. Shell
B. Nucleus
C. Energy levels
D. Orbit
Submitted by: Aamir khan Hullio
The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge.
The correct answer to the question: "The Maximum mass of an atom is present in ___________?" is "Nucleus".