Why do alkali metals are soft and can be cut with help of
Mar 22, 2015· Due to the presence of weak metallic bonding alkali metals are soft and can be cut with a knife. ii) Reactivity of metals depends on ionization energy or ionization enthalpy. Ionization enthalpy of an element depends on its atomic radius. Larger the atomic size smaller is the ionization enthalpy, greater is the reactivity.