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Leaving cert Chem

2- Radioactivity

QuestionAnswer
2008 Q4 Give two properties of alpha particles 1. Positively charged. 2. Relatively low penetration ability being stopped by paper.
2009 Q4 What change occurs in the nucleus of an atom when it undergoes beta emission? The nucleus becomes a proton and an electron. The atomic number increases by 1
2010 Q11 Define radioactivity. The spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation
2010 Q11 Define the half-life of a radioactive isotope. The time taken for half the nuclei in any given sample to decay
2010 Q11 State one risk associated with exposure to alpha radiation. Cancer
2011 Q10 What are isotopes? Isotopes are atoms with the same atomic number but a different mass number due to different numbers of protons in the nucleus
2011 Q10 Define radioisotope. A radioactive isotope.
2013 Q10 Give two differences between chemical and nuclear reactions. 1. Chemical reactions involve the electrons where as nuclear reactions take place in the nucleus. 2. New elements are formed in nuclear reactions.
2013 Q10 Give two properties of beta particles. 1. They are fast moving electrons. 2. Have more penetrating ability than alpha particles.
Created by: neilkelly