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Chemistry

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    $\begingroup$ Hydrides like $\ce{NaH, CaH2}$ are ionic. Compounds or ions made by hydrogen and non-metals are covalent : $\ce{B2H6, BH4^-, CH4, SiH4, NH3, PH3, AsH3, H2O, OH-, H2S, H2Te, HF, HF2^-, HCl, HBr, HI}$. Even coordinate bonds in $\ce{AlH4^- }$ are covalent. Interstitial hydrides are relatively rare, like $\ce{H2}$ dissolved into palladium. $\endgroup$
    – Maurice
    Commented Sep 20, 2022 at 9:33
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    $\begingroup$ @Maurice - those of us coming from the materials side are more familiar with interstitial hydrides, since that is how most metal hydrides (solid phases) form. Just a matter of perspective... $\endgroup$
    – Jon Custer
    Commented Sep 20, 2022 at 13:40