固体元素可能是自己的，也可能是外部。
经过了20年的光阴，旧填充物表面有95%的汞元素已经发生了化学反应，它变成了黑辰砂(beta - mercury sulfide)，一种黑色的固体。
After two decades, 95 percent of the elemental mercury on the surface of a filling had gone through a chemical reaction. It became beta-mercury sulfide, a black-colored solid.
一种元素到底属于固体、液体还是气体，要视其原子之间的相互作用而定，但它们与其它物质(如金)之间的相互作用，可相当于前一相互作用的“代理方式”。
Whether an element is a solid, a liquid or a gas depends on how its atoms interact with each other. But how they interact with other substances, such as gold, ACTS as a proxy for that behaviour.
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