unstable e atom 不稳定原子
An unstable atom gives off its excess energy until it becomes stable.
不稳定的原子释放出多余的能量，直到变得稳定。
An unstable atom gives off its excess energy until it becomes stable. The energy emitted is radiation.
不稳定原子在达到稳定状态前，需要释放出自身多余的能量，这一能量即辐射。
The process by which an atom changes from an unstable state to a morestable state by emittingradiation is called radioactive decay or radioactivity.
这种原子通过释放射线从不稳定状态变到更加稳定的状态的过程被称为核衰减或放射。
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