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How large is the nucleus compared to the size of an atom?
原子核与原子的大小相比如何？
What is an isotope and how do you indicate the isotope with the chemical symbol?
什么是同位素，如何用化学符号表示同位素？
What are the common types of radioactivity?
什么是常见的放射性类型？
What are the ways to assess radiation exposure?
如何评估辐射暴露？
What is the difference between nuclear fission and nuclear fusion?
核裂变和核聚变有什么不同？
What is the source of the energy which makes stars shine?
是什么能源使恒星发光？
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