Question

The ratio of radii of the first three orbits is an atom is :
A) 1 : 2 : 3     B) 3 : 2 : 1      C) 1 : 4 : 9         D) 9 : 4 : 1​

Answer 1

Answer:

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Answer 2

Radius∝ n²/z

Z is same for a particular atom,

Therefore, ratio=(1)²: (2)²: (3)²=1:4:9

Hence, option C is correct.