periodic - Lorentz JÄNTSCHI

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Properties and measures
Anion: atom or group of atoms containing more electrons
than protons – consequence – any negative charged
system is referred as anion; Cation: idem opposite
Atomic radius: measure of the relative dimension of the
atoms (see O2 and H2O) Electron affinity: measure of the ability or tendency of a
atom to get electrons – energetic concept – formal
definition refers just one electron: X + 1e- → X-1 + E.A.
Electronegativity: ability of a bound atom to attract
electrons; at the bond level, the electron may be shared or
transferred; there are many electronegativity scales.
Ionization potential: from energetic process leading to the
cation: X + I.P. → X + + 1e- ; it exists also superior (or
supplementary) ionization potentials (ex. X + +I.P.2 → X2+ +
1e- )