The radius of the n = 1 orbit in the hydrogen atom is 0.053 nm. What is the radius of the n = 3 orbit of a singly charged lithium, which has three protons in its nucleus?
A) 30.053) nm
B) 90.053) nm
C) 0.053 nm
D) 1/3)0.053) nm
E) 1/9)0.053) nm

Question

Quizplus · Accepted Answer

The radius of the orbit is proportional to n^2 and inversely proportional to the atomic number. Lithium has three protons, so the radius of the n = 3 orbit is 3^2/1^2 * 0.053 nm = 0.477 nm.

The Radius of the N = 1 Orbit in the Hydrogen