Atomic radius is the measure of the distance from the centre of the nucleus to the outer electron.
The nuclear charge of an atom is the measure of the effect of attraction between the protons in the nucleus and the outer electron
Shielding is the effect of the inner shells of electrons on weakening the attraction between the protons in the nucleus and the outer electron.
Ionisation energy is a measure of the amount of energy required to remove an outer electron from an atom creating a positively charged ion.
The atomic radius is a measure of the distance from the nucleus to the valence electron.
Ionic radius can be defined as the size of the radius of an ion from the nucleus to the valence electron. The ionic radius is difficult to measure due to the overlap of ions in a lattice structure.
Electron affinity is a measure of the energy released when an electron is added to an atom to create a negatively charged ion.