1. Look at this picture of a neutral atom:
How many protons, electrons, and neutrons does it have? What element is it?
2. Complete this table:
| Radiation | What it is | Range | Stopped by |
| Alpha (a) | 1 cm in air | Skin, sheet of paper | |
| Beta (b) | High speed electron | 3 mm aluminium sheet | |
| Gamma (g) | Electromagnetic radiation | Infinite |
3.
The atomic number is the number of ____.
The ____ number is the number of protons and neutrons.
4. Complete this table:
| Element | Mass Number | Atomic Number | Neutrons |
| Uranium 238 | 92 | 146 | |
| Uranium 235 | 235 | 92 | |
| Plutonium | 233 | 139 |
5. Alpha and beta particles, and gamma rays are passed through an electric field as shown in the picture:
What does this tell you about the charge (if any) on the particles?