How wouldyou explainthe lower atomicradius of Ga as compared to Al ?

1.	How wouldyou explainthe lower atomicradius of Ga as compared to Al ?
Answer» Solution :DUE to poor shielding of the valence electrons of GA by the inner 3d-electrons, the effectivenuclear charge of Ga is greter in magnitudethan that of Al. As a result, the electrons in gallium experiencegreater force of attractionby then nucleusthan in Al and henceatomic size of Ga (135 pm) is slightly LESS than of Al (143 pm).

Discussion