Uranium is a chemical element.

铀是一种化学元素。

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Radium is a chemical element.

镭是一种化学元素。

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Zinc is a chemical element which is very important to our health.

锌是一种对人体健康很有益处的元素。

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Silicon is a chemical element (Si), which can be found on the Periodic Table.

FORBES: Defining Silicon Beach

This knowledge is needed to design a chemical that looks enough like the relevant spike element to prompt the immune system to make antibodies that will neutralise it.

ECONOMIST: AIDS vaccines

The element to be purified is first incorporated into a chemical that can be turned into a gas. (In this case, the exact compound is still proprietary information.) Then an infra-red laser is shone through the gas.

ECONOMIST: Diamonds