The ball with which Table Tennis is played is called Ping Pong Ball.
According to the International rules, the diameter of the ping pong ballmust be not less than 39.5 millimeters and not greater than 40.5 millimeters having a mass of 2.7 grams.
Flourine is the most electro negative element due to its small atomic radius .It also has the tendency to accept an electron to complete octet configuration