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The wave function orbital of H-like atom...

The wave function orbital of H-like atoms is given as onder
`psi_(2s) = (1)/(4sqrt(2pi)) Z^(3//2) (2 - Zr)^(Zr//2)`
Given that the radius is in `Å` then which of the following is the radius for nodal surface for `He^(Theta)` ion ?

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