- The mass of the atom is determined by protons and neutrons
- The nucleus of an atom is made of protons and neutrons
- So, most of the mass of an atom is located in the nucleus

Therefore, most of the mass of an atom is located in the nucleus
Q: Where is most of the mass of the atom located?
Context:
- The mass of the atom is determined by protons and neutrons 
- The nucleus of an atom is made of protons and neutrons