Dense center of an atom made of neutrons and protons
- The dense center of an atom made up of protons and neutrons
- The dense center of an atom made of positive protons and neutral neutrons
- The positively charged dense center of an atom made up of protons and neutrons
- The small and dense region at the center of an atom made up of protons and neutrons
- Развлечеба про молекулы и атомы