Which of the following atoms has the minimum covalent radius?

Identify the correct order of ionic radii of the given species.

Given two statements below :
Statement $I:$ In $Cl_2$ molecule the covalent radius is double of the atomic radius of chlorine.
Statement $II:$ Radius of anionic species is always greater than their parent atomic radius.
Choose the most appropriate answer from options given below :

Arrange $Na, Na^+, F, F^-$ in the decreasing order of their radii (size).

$Na^{+}$,$Mg^{2+}$,$Al^{3+}$,and $Si^{4+}$ are isoelectronic. Their ionic size follows the order:

Which of the following statements is incorrect?