Which of the following anions has the smallest radius?

The correct order of increasing radius of the elements $Si$,$Al$,$Na$ and $P$ is

Which of the following is the correct increasing order of ionic radii for $N^{3-}$,$Na^+$,$F^-$,$O^{2-}$,and $Mg^{2+}$?

The statement$(s)$ that are correct about the species $O^{2-}$,$F^{-}$,$Na^{+}$,and $Mg^{2+}$.
$(A)$ All are isoelectronic
$(B)$ All have the same nuclear charge
$(C)$ $O^{2-}$ has the largest ionic radii
$(D)$ $Mg^{2+}$ has the smallest ionic radii
Choose the most appropriate answer from the options given below :

Arrange $K^{+}$,$Cl^{-}$,$S^{2-}$,and $Ca^{2+}$ in decreasing order of their ionic radii with an explanation.

Which of the following represents the incorrect order of ionic size?