Question

Correct order of atomic radii is :
परमाणु त्रिज्या का सही क्रम है :
(1) B< A] < Ga < In
(3) A1 < Ga < B < In
| (2)
| (4)
B < Ga < A1 < In
Ga < B < A1 < In
​

Answer 1

boron, aluminium, gallium, indium and thallium .........

atomic radius increases down the period ..... so

this may help you

Answer 2

Answer:

C = B<Ga<Al<In<Tl  

Explanation-

As we go from top to bottom in the 13th group of the periodic table the atomic and ionic radii increases. It is because of the increasing number of shells from top to bottom. But an important point to note here is that atomic radii of Ga are lesser than Al and despite their positioning. Thus, we have Ga placed before Aluminium in the answer.