Gallium has muchhigher atomicnumberthan aluminium yet its atomicradius is lower thanthat of aluminium. Justify.

Gallium has muchhigher atomicnumberthan aluminium yet its atomicradius

1.	Gallium has muchhigher atomicnumberthan aluminium yet its atomicradius is lower thanthat of aluminium. Justify.
Answer» Solution :DUE to poorshielding of the valenceelectrons of Gaby the inner 3d-electrons , the effectivenuclearcharge of Ga is greaterin magnitudethan that of Al. As a RESULT , the electronin gallium experience greaterforce of attractionby the nucleus than in ALAND HENCE atomic size of Ga (135pm)is SLIGHTLY lessmuch higher than that of Al (143pm).