PH-2091
Atomic structure and isotopes
Physics · Secondary 4 · Medium · Atomic structure and isotopes
A beam of alpha-particles is directed at a thin metal foil. Most particles pass straight through, but a few are deflected through large angles. What does this observation suggest about the structure of the atom?
- Electrons are fixed inside a solid positive sphere
- Positive charge is spread evenly throughout the atom
- The atom is mostly empty space with a small dense nucleus
- The nucleus is large and occupies most of the atom
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