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?
-
A.
electropositivity decreases from Li to Na to K -
B.
electronegativity decreases from Li to Na to K -
C.
the number of the electron shells increases from Li to Na to K -
D.
the elements are in the same period