3. Chemical Properties
• The alkali metals are
highly reactive due to
their large size and low
ionization enthalpy.
• The reactivity of these
metals increases down
the group.
4.
5. • In all these oxides the oxidation state of the
alkali metal is +1.
• Lithium shows exceptional behaviour in reacting
directly with nitrogen of air to form the nitride,
Li3N as well.
• Because of their high reactivity towards air and
water, alkali metals are normally kept in
kerosene oil.
6.
7. Reactivity towards water
• The alkali metals react with water to form hydroxide and dihydrogen.
• lithium react with water less vigorous than that of sodium among the alkali
metals.
• This behaviour of lithium is attributed to its small size and very high hydration
energy.
• Other metals of the group react explosively with water. They also react with
proton donors such as alcohol, gaseous ammonia and alkynes
