In a scattering experiment, 480 000 alpha particles travel towards a very thin tungsten foil.
| Recorded path | Number of alpha particles |
|---|---|
| Continued forwards or changed direction by a very small angle | 479 880 |
| Changed direction by a large angle | 108 |
| Returned towards the source | 12 |
Which conclusion is best supported by these observations?
The positive charge of each tungsten atom is concentrated in its nucleus.
The mass of each tungsten atom is distributed throughout its electron shells.
Electrons in tungsten atoms are massive enough to reverse some alpha particles.
The centre of each tungsten atom has no overall electric charge.
101 exam-style questions on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one has a worked solution and a mark scheme showing where the marks go.