Physics mini mock 0.0 / 5 ? PhysicsRadioactivityGCSENone Created by: TCadmanCreated on: 16-05-17 18:53 What did Neil Bohr contribute to the model of the atom? That the electrons orbited the nucleus. 1 of 6 How did Neil Bohr know that the electrons orbited a positive nucleus? Fired alpha particles alpha particles at it an observed that some passed through and some were repelled. 2 of 6 What order were the composites of the atom discovered in? Electron, proton, neutron. 3 of 6 What is the name of an object that has been exposed to nuclear radiation? Irradiation 4 of 6 What should radioactive substances be held with? Radioactive substances should be held with sweaters and a layer of lead to stop the radiation. 5 of 6 In medicine, doctors use what piece of equipment to see tumours? Radioactive tracers. 6 of 6
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