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complex ammoniate ca[nh ] . heating calcium with silicon, phosphorus, or graphite in the absence of air gives calcium silicides (ca si, casi, and casi ), calcium phosphide (ca p ), and calcium carbide (cac ), respectively. calcium forms intermetallic compounds with aluminum, silver, gold, copper, lithium
necessary for the normal progress of the life processes. it is present in all tissues and fluids in animals and plants. only rarely are organisms capable of developing in an environment lacking in calcium. in some organisms the calcium content is as high as percent; in man, the content is - percent. the cells...
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