1.) When is the nucleus said to be unstable?
2.) Which diseases are caused by artificial food colours?
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1.) When is the nucleus said to be unstable?
2.) Which diseases are caused by artificial food colours?
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1)Atoms of the same element with different numbers of neutrons are called isotopes. Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes. Their nuclei are unstable, so they break down, or decay, and emit radiation.
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