Hydrogen forms compounds with elements having atomic numbers : \( 9,11,12,17 \) and 20 . What ar...
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0Hydrogen forms compounds with elements having atomic numbers : \( 9,11,12,17 \) and 20 . What are their chemical formulae ? Compare their chemical behaviour.
\( \left[\right. \) Hint. \( \mathrm{HF}, \mathrm{NaH}, \mathrm{MgH}_{2}, \mathrm{HCl} \) and \( \left.\mathrm{CaH}_{2}\right] \)
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