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Question: The ratio of the radii of first orbits of H, He<sup>+</sup> and Li<sup>2+</sup> is –...

The ratio of the radii of first orbits of H, He+ and Li2+ is –

A

1 : 2 : 3

B

6 : 3 : 2

C

1 : 4 : 9

D

9 : 4 : 1

Answer

6 : 3 : 2

Explanation

Solution

The ratio is 1 : 12\frac{1}{2} : 13\frac{1}{3}

or 6 : 3 : 2