What is meant by radioactivity? Which are the three types of radiation given out by radioactive substances?
[3 marks]

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Solution

Elements like thorium, radium and uranium that have a high atomic number and spontaneously emit invisible, highly penetrating radiation of high energy. This property of these elements is known as radioactivity. [1.5 marks]
Three types of radiation given out by radioactive substances are alpha, beta and gamma rays. [1.5 marks]

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