Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 3 - No. 42)
What makes a substance radioactive?
The element has a high atomic number
The element is unstable and decays spontaneously
The element has more neutrons than protons.
The element has a low atomic number.
Explanation
A radioactive substance is unstable and undergoes spontaneous nuclear decay, emitting particles and/or energy.
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