Definition
phosphide: A binary compound ofphosphorus with a more electropositiveelement. Phosphides show awide range of properties. Alkali andalkaline earth metals form ionicphosphides, such as Na
3P and Ca
3P
2,which are readily hydrolysed bywater. The other transition-metalphosphides are inert metallic-lookingsolids with high melting points andelectrical conductivities.