Metal with hydrogen
–Sodium
+ hydrogen ®
sodium hydride
–Na(s) + H2 (g) ® NaH(s)
–Lithium
+ hydrogen ®
Lithium hydride
–Li(s) + H2 (g) ® LiH(s)
–Magnesium
+ hydrogen ®
potassium hydride
–Mg(s) + H2 (g) ® MgH2(s)
In general then,
–Metal
+ hydrogen ®
metal hydride