Why is ionic radii of lithium positive more than magnesium 2 positive ?

Q. Why cesium is more electron positive than francium?

Q. Why is the $E^0$ value of ${Mn}^{+3}/{Mn}^{+2}$ couple much more positive than ${Cr}^{+3}/{Cr}^{+2}$.

Q. Statement 1: Magnesium is more reactive than lead
Statement 2: Aluminium is more reactive than magnesium

Q. Assertion :Reduction potential of $Mn(+3$ to $+2)$ is more positive than $Fe(+3$ to $+2)$. Reason: Ionisation potential of $Mn$ is more than that of $Fe$.

Q. Assertion :Lithium shows some similarities with magnesium. Reason: They possess almost equal ionic sizes.