The average radius (rav), at which an electron will be found when it occupies a 1S orbital of a hydrogenic atom with atomic number Z
\({{\Psi _{1s}}\left( r \right) = {1 \over {\sqrt \pi }}{{\left( {{Z \over {{a_o}}}} \right)}^{{3 \over 2}}}{e^{ - {{zr} \over {n{a_o}}}}}}\)
1
\({{3{a_o}} \over {2Z}}\)
2
\({{{a_o}} \over Z}\)
3
\({{{a_o}} \over {2Z}}\)
4
\({{3{a_o}} \over {Z}}\)
5
Question Not Attempted