Metallic hydrides can be formed from transition metals.

Metallic hydrides can conduct electricity.

All metallic hydrides are ionic compounds.

Metallic hydrides can absorb hydrogen gas.

${\rm{Pd }}\;{\rm{on}}\;{\rm{CuC}}{{\rm{l}}_2}$

Ni

Fe

${{\rm{V}}_2}{{\rm{O}}_5}$

${\rm{C}}{{\rm{O}}_2}$

$CO$

${{\rm{O}}_2}$

${{\rm{C}}_2}{{\rm{H}}_2}$

In the molten state they conduct electricity

They dissolve in water giving off hydrogen

They are used as reducing agents

They are covalent in nature

$Ca$

$Cu$

$Zn$

$Fe$

Scheele

Berzelius

Cavendish

Priestley

1

2

3

Zero

${\left( {B{H_3}} \right)_2}$

$P{H_3}$

${\left( {C{H_3}} \right)_2}$

${\left( {Si{H_3}} \right)_2}$

Protium

Deuterium

Tritium

All isotopes produce water with the same molar mass

$Mg$

$Hg$

$Fe$

$Zn$

Finely divided $Ni$

${V_2}{O_5}$

$Pb$

$F{e_2}{O_3} + C{r_2}{O_3}$