2. Click for solutions √ number of protons number of neutrons 6 6 8

3. The force on an object due to gravity Click for solutions √ √ √ √ 92 4 2 233 7 0 14

4. The force on an object due to gravity Click for solutions √ √ √ √ Positive as it repelled the positive alpha particles

5. The force on an object due to gravity Click for solutions √ √ √ for each half life multiply by ½ ¼ = ½ x ½ = 2 half lives 2 half lives = 138 x 2 = 276 days

6. The force on an object due to gravity Click for solutions √ √ √ √ half life = time it takes the initial activity to halve.

7. The force on an object due to gravity Click for solutions √ √ √ √ Two light nuclei join together to produce a larger nucleus A large nucleus splits and produces smaller nuclei Production of electricity in nuclear power stations The Sun