among Na , Mg and Al which is more metallic...please give explanation 

Dear student, Na, Sodium has the highest metallic property because it is in the 1st group of the Periodic table. it has the lowest electronegativity which means it easier loses electrons. Mg is the second metal in this group, it is from the second group of the periodic table, hence weaker metal properties than Na. Al is from the third group, hence its metallic properties are much more weaker. With regards!