noun 下载 🔗分享 氟 The chemical element (symbol F) with an atomic number of 9. It is the lightest of the halogens, a pale yellow-green, highly reactive gas that attacks all metals. Examples : "Because fluorine is so reactive, it is often used to create stronger compounds like those found in Teflon and some toothpastes. " 由于氟的反应性极强，它常被用来制造更强的化合物，比如特氟龙和一些牙膏中的成分。 element chemistry substance science material 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 氟原子 A single atom of this element. Examples : "an octahedron of fluorines" 一个氟原子构成的八面体 element chemistry substance 与AI对话词汇游戏阅读练习
