Here are the evaluations for each statement:
| Statement | True | False | |---------------------------------------------------------------------------|------|-------| | The nucleus of an atom is found in the atom's center. | ✔️ | | | The nucleus of an atom contains at least one proton. | ✔️ | | | A neutron has a positive electrical charge. | | ✔️ | | Most of an atom's mass is found in protons and neutrons. | ✔️ | |
Explanation:
- The nucleus is indeed at the center of an atom.
- Most atomic nuclei contain at least one proton, making this statement true.
- Neutrons have no charge; they are neutral, thus the third statement is false.
- The mass of an atom is primarily concentrated in the protons and neutrons located in the nucleus.