Periodic properties can be chemical properties or physical properties. Correct statement about periodic properties is

(1) Vanderwaals radius measured for solids

$\left(2\right){{\mathrm{O}}^{-}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-}\to {\mathrm{O}}^{-2};\mathrm{\Delta H}=+780\mathrm{kJ}/\mathrm{mole}$

$2^{\mathrm{nd}}$ electron gain enthalpy is always positive due to the repulsions between negative charge and added electron

(3) ${\mathrm{\Delta H}}_{\mathrm{eg}}$  for Noble gases is positive due to stable configuration 
(4) For Cu, Metallic radius (Atomic radius ) > Covalent radius