The main group elements i.e. representative elements complete their electron configuration using s and p electrons in the periodic table. These elements range from the most metallic to the most non-metallic with intermediate properties, the semi-metals, in between .The elements which occur at the two extremes of the periodic table are highly reactive and therefore, these highly reactive elements do not occur in free state : they usually occur in the combined forms. Beryllium and aluminium exhibit many properties which are similar, but, the two elements differ in :

The main group elements i.e. representative elements complete their el

1.	The main group elements i.e. representative elements complete their electron configuration using s and p electrons in the periodic table. These elements range from the most metallic to the most non-metallic with intermediate properties, the semi-metals, in between .The elements which occur at the two extremes of the periodic table are highly reactive and therefore, these highly reactive elements do not occur in free state : they usually occur in the combined forms. Beryllium and aluminium exhibit many properties which are similar, but, the two elements differ in :
Answer» FORMING covalent HALIDES Forming polymeric hydrides Exhibiting maximum COVALENCY in compounds Exhibiting AMPHOTERIC nature in their oxides Solution :Beryllium has the maximum vallency +2 while aluminium exhibits its valency as +3.