Describe the chemical reactions of the lanthanoids with $H_2$ and $O_2$.
(N/A) Lanthanoids react with $H_2$ when heated to form hydrides of the formula $LnH_2$ and $LnH_3$ (where $Ln$ represents a lanthanoid element).
Lanthanoids react with $O_2$ when heated to form oxides of the formula $Ln_2O_3$ (where $Ln$ represents a lanthanoid element).
Lanthanoids react with $O_2$ when heated to form oxides of the formula $Ln_2O_3$ (where $Ln$ represents a lanthanoid element).
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