JAMB - Chemistry (1989 - No. 6)
The atomic radius of Li, Na and K are 1: 33A, 1. 54A and 1. 96A res pectively. Which of the following explaqins this gradation in atomic radius?
electropositivity decreases from Li to Na to K
electronegativity decreases from Li to Na to K
the number of the electron shells increases from Li to Na to K
the elements are in the same period