Atomic radius, non-bonded
Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. These values were determined using several different methods.
Covalent radiusHalf of the distance between two atoms within a single covalent bond. Values are given for typical oxidation number and coordination.
Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed.
Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale.
First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state.