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What comes to mind when you hear the word radioactive

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Why some elements are radioactive (unstable). When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable. Whether radioactive elements can become stable and if so, how. The unstable nucleus of radioactive atoms emit radiation
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User Tvanfosson
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Answer:the act of emitting radiation spontaneously

Step-by-step explanation:

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User Sufiane
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