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nature : metallic or non-metallic element with a hydride compounds derived. Generally refers to metal hydride, lithium hydride and sodium LiH such as NaH. Because hydrogen atoms special structure, it can create three types of HG : (1) Salt HG such as lithium hydride with lattice ions (cations and anions set of interchangeable) and high melting point, when the liquid is a good conductor of electricity; (2) volatile hydride , such as hydrogen chloride, water, etc., with molecular lattice (derived from the molecular arrangement), a lower melting point and the boiling point, volatile, almost no electrical conductivity; (3) Metal-Hydride hydride as iron, cobalt hydride, with similar alloy structure.
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