5297087
Description
Flashcards by Sarah Collinson, updated more than 1 year ago
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Created by Sarah Collinson
over 9 years ago
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| Question | Answer |
| What makes a substance radioactive? | When nuclei are unstable |
| What are isotopes? | Atoms of the same element with an equal number of protons and electrons, but with a different number of neutrons |
| How do radioactive nuclei become stable? | Through radioactive decay |
| What is background radiation? | Radiation in the atmosphere around us all the time |
| Give 3 examples of sources of background radiation | - Cosmic rays from space - Rocks underground - Manmade sources, eg. x-ray machines |
| When will an unstable nucleus decay? | It is impossible to predict |
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