1. Fill the gap. Some elements have ..................... isotopes which decay over time.
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Other questions in this quiz
2. What are Polymers?
- Thermosoftening or Thermosetting
- Thermoheating or Thermoheating
- Thermohardening or Thermosoftening
- Thermorecycling or Thermosetting
3. What is the symbol of these elements; Fluorine, Chlorine, Bromine and Iodine
4. What year was the discovery of the electron
5. What does all matter consist of?