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氟在元素中要算是最凶狠的一员,化学家向来不大和它有来往的,但是现在亦被人收服了。这个元素是和氯、溴、碘、同属一族,名为卤素。它们这一族都是有名的坏东西,碘虽是比较的性情好些,但是和它接触亦要留神。氟是最可怕的,和氢化合了成氟化氢,亦是一个最凶猛的东西,溶在水里所成的酸,除了黄白二金以外任何金属遇着都要消的。玻璃陶器以及一切含有矽土的东西都吃它的苦头。动植物质都见它怕。发出来的毒烟是根本嗅不得的。碰着皮肤就溃烂不容
Fluorine in the elements to be considered the most fierce one, chemists have always had little contact with it, but now it has been overcome. This element is chlorine, bromine, iodine, belong to the same family, called halogen. All of them are notoriously bad things. Although iodine is more temperamental, we should also pay attention to it. Fluorine is the most terrible, and hydrogenated into hydrogen fluoride, is also one of the most ferocious things, dissolved in water into the acid, in addition to yellow and white except for any other metal to be eliminated. Glass earthenware and everything that contains silica is eating it. Animals and plants are all afraid of it. Issued poisonous tobacco is simply not smellable. Try to touch the skin ulceration