Chemistry the most boring subject ever for a student.......... Remembering the 1 to 20 atomic number It's configurations valency etc....... Make this a fun I being a teacher make my students learn it With one example..... Like considering a hostel rooms having Capacity of 2 bed, 8 bed, 8 bed, 18 bed Filling rules First person to go in first room then second in same Then and then other room is opened So if 19 students 2 to first room 8 to second 8 to third 1 to last And number of student In last