(i) Metals show tendency to lose electrons. Therefore, they are said to be electropositive.
(ii) Non-metals show the tendency to accept electrons or share electrons with another atoms. Therefore, they are said to be electronegative.
(iii) Across the period from left to right, metallic character decreases and non-metallic character increases.
(iv) This is because the atomic size decreases due to greater nuclear pull because of which valence electrons cannot be easily removed.
(v) Down the group-metallic character increases and non-metallic character decreases from top to bottom in a group.
(vi) As atomic number increases from top to bottom in a group, newer shells get added which in turn increases its atomic size. Thus nuclear pull decreases due to addition of newer shells and thus the valence electrons present in outermost shell can be easily removed from the atom.
(vii) The three types of elements can be easily shown in the Modern Periodic table with the help of zig- zag line.
(viii) The metalloid elements lie along the border of this zig-zag line. All the metals lie on the left side of zig-zag line while all the non-metals lie on the right side.