磷是一种化学元素,符号为P,原子序数为15.元素磷以白磷和红磷两种主要形式存在,但由于其高度活性,磷在地球上从未被发现是自由元素.它在地壳中的浓度约为每千克1克(而铜的浓度约为每千克0.06克).除少数例外,含磷矿物以无机磷酸盐岩的形式处于最大氧化状态.
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