Arrange the elements $S, O, Na,$ and $Li$ in the decreasing order of their atomic radii.

The species $Ar$,$K^{+}$ and $Ca^{2+}$ contain the same number of electrons. In which order do their radii increase?

The atomic radius of gallium is less than that of aluminium. This is due to

Arrange the following elements in the increasing order of their atomic radii:
$(i)$ $O, N, F, B, Be, Li, C$
$(ii)$ $P, S, Mg, Na, Al, Si, Cl$
$(iii)$ $K, Na, Li, Cs, Rb$
$(iv)$ $Cl, F, I, At, Br$

Which of the following represents the correct order of ionic radii?

Which of the following sequences is correct for the decreasing order of ionic radius?