NCERT Class XII Chapter <br>Atoms <br> Questions With Solutions

NCERT Class XII Chapter
Atoms
Questions With Solutions

Question : 8

Total: 18

The radius of the innermost electron orbit of a hydrogen atom is 5.3 × 10–11 m. What are the radii of the n = 2 and n = 3 orbits?

Solution:

Radius of innermost electron, r =

n2h2ε0

πme2

For n = 1 , r1 =

h2ε0

πme2

= 5.3 × 10−11 m
For n = 2, r2 = (2)2r1 = 2.12 × 10–10 m
For n = 3, r3 = (3)2r1 = 4.77 × 10–10 m.

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