The metals of the first series with the exception of copper are relatively
more reactive and are oxidised by 1M H
+, though the actual rate at
which these metals react with oxidising agents like hydrogen ion (H
+) is
sometimes slow For example, titanium and vanadium, in practice, are
passive to dilute non oxidising acids at room temperature The E
o values
for M
2+/M (Table 4 2) indicate a decreasing tendency to form divalent
cations across the series