Question

Out of the following, which is the correct match for the radial probability of finding the electron for $2\,s$ orbital

• A. $A - H , B - He ^{+}, C - Li ^{2+}$
• B. $A - He ^{+}, B - H , C - Li ^{2+}$
• C. Can't say
• D. $A - Li ^{2+}, B - He ^{+}, C - H$

Answer 1

Answer: (D)

Radial nodes for $2\, s$ orbital is at distance $\frac{2 a _{0}}{ Z }$
For( A ) $\frac{2 a _{0}}{ Z }$ is least $Z =3$ for $Li ^{2+}$
For $(B) \frac{2 a_{0}}{Z}$ is intermediate $Z =2$ for $He ^{+}$
For (C) $\frac{2 a_{0}}{z}$ is maximum $Z =1$ for $H$.
$A - Li ^{2+}, B - He ^{+}, C - H$