WTA : does atomic mass matter to atom's radius?

[adi adi]

Homework Statement

so my friend asked this question: "what's the atomic radius ratio between He-3 and He-4?"
2. Homework Equations
all i know is this equation : r =nh/mv
3. The Attempt at a Solution
i thought the ratio will be same because both He-3 and He-4 have only two electrons. Correct me if I am wrong please

 

[ash64449]

Nuclear radius will be different but atomic radius will remain the same. As atomic radius is the distance between the center of the nuclei to the outermost electron-which is same for both.

ratio is 1 and 'not same'

 

[adi adi]

Nuclear radius will be different but atomic radius will remain the same. As atomic radius is the distance between the center of the nuclei to the outermost electron-which is same for both.

ratio is 1 and 'not same'

so to make clear things the ratio of atomic radius is same but the nuclear radius isn't same right?

 

[ash64449]

ratio of atomic radius is same

You should actually say atomic radius of both are same and ratio is 1.

nuclear radius isn't same right?

yes. You can understand it by the formula:

R=R_0*A^(1/3)

where A-Mass number, R_0 is a constant