A. Electrons and protons
B. Protons and neutrons
C. Electrons and neutrons
D. Neutrons and positrons
Answer: Protons and neutrons
A. Electrons and protons
B. Protons and neutrons
C. Electrons and neutrons
D. Neutrons and positrons
Answer: Protons and neutrons
Additional Information: The nucleus of an atom contains protons and neutrons.
Subjects: Atomic Structure, Chemistry