  We studied the charge radius, rms radius and neutron skin thickness $\Delta
r_{np}$ in even-even isotopes of Si, S, Ar and Ca and isotones of N =20, 28, 50
and 82. The $\Delta r_{np}$ in doubly-magic $^{48}$Ca, $^{68}$Ni,
$^{120,132}$Sn and $^{208}$Pb nuclei has also been calculated. Theoretical
calculations are done with the Hartree-Fock-Bogoliubov theory with the
effective Skyrme interactions. Calculated theoretical estimates are in good
agreement with the recently available experimental data. The charge radii for
Si, S, Ar and Ca isotopes is observed to be minimum at neutron number N =14.
The theoretically computed results with UNEDF0 model parameterization of
functional are reasonably reproducing the experimental data for $\Delta r_{np}$
in $^{48}$Ca, $^{68}$Ni and $^{120,132}$Sn. The energy density functional of
UNEDF1 model provides much improved result of $\Delta r_{np}$ for $^{208}$Pb.
