P4 0.0 / 5 ? ScienceAtomsGCSEAQA Created by: YEETUSdeleetusfetusCreated on: 02-01-22 18:08 10427693158 Across 1. What was J J Thompsons theory? (4, 7, 5) 6. Has no mass or charge and can be stopped by thick sheets of lead and multiple metres of concrete. (5) 7. Time taken for number of radioactive nuclei/activity to half. (4, 4) 8. Who discovered neutrons? (5, 8) Down 2. who developed the first atomic theory? (10) 3. Who developed democritus' ideas? (4, 6) 4. Only one or two isotopes are stable. (11, 5) 5. Who developed the nuclear model? (5, 4) 9. I have the same number of protons, different number of neutrons. What am I? (7) 10. C an be absorbed by a sheet of paper. Consists of 2 neutrons and 2 protons. (5)
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