Fill in the blanks in the following statements:
(a) The horizontal rows in a periodic table are called…………………..
(b) In going across a period (right to left)( in periodic table, the atomic size of the atom…………..
(c) On moving from right to left in the second period, the number of valence electrons..............
(d) On going down in a group in the periodic table, the metallic character of elements..................
(e) The tendency to gain an electron .................. on moving down in a group of the periodic table.