s block elements

Dear student,

The outermost orbital of s block elements consists of one or two electrons. Next to the outer most penultimate shell has either 2 or 8 electrons. s-block elements show a fixed valency which depends on the number of electrons present in the outermost shell.

Except hydrogen , all  s-block elements have low values of ionisation potential decreases in the case of alkali metals and alkaline earth metals as the atomic number increases . Ionisation potential increases on moving horizontally from IA to IIA. On account of low values of ionisation potentials , these elements are highly electropositve , i.e., easily lose valency electrons and form cations.

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