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n. a nonmetallic element. Phosphorus compounds are major constituents in the tissues of both plants and animals. In humans, phosphorus is mostly concentrated in bone. However, certain phosphorus-containing compounds – for example adenosine triphosphate (ATP) and creatine phosphate – play an important part in energy conversions and storage in the body. In a pure state, phosphorus is toxic. Symbol: P.

Subjects: Science and Mathematics — Medicine and Health.

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