The outmost orbital of the s block elements comprises of one or two electrons. After the outer most penultimate shell have either 2 or 8 electrons. The s-block elements show the fixed valency which depends on number of electrons present in the outermost shell.
Except the hydrogen, all s-block elements have low values of ionization potential decreases in the case of alkali metals and alkaline earth metals as the atomic number increases . Ionization potential increases on moving horizontally from IA to IIA. On account of low values of ionization potentials, these elements are highly electropositive, that is easily lose valency electrons and form cations.
The elements of groups of p block elements exhibit a range of properties. Several of the trends observed in this group can be understood from considerations of their electron configurations and their respective positions in the periodic table. For instance, the inert pair of valence-shell electrons retained in the Ti+ ion is also found in several other cations following a transition series.
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