SELECT * FROM question_mgmt as q WHERE id=3157 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=52 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry The p Block Elements how would you explain the lower atomic radius of g

Question:

How would you explain the lower atomic radius of Ga as compared to Al?

Answer:

                                                     Atomic Radius (in pm)

Aluminium 143
Gallium 135

Although Ga has one shell more than Al, its size is lesser than Al. This is because of the poor shielding effect of the 3d-electrons. The shielding effect of d-electrons is very poor and effective nuclear charge experienced by the valence electrons in gallium is much more than that of Al.


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