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Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. This includes ions as well as neutral atoms and, unless otherwise stated, for the purposes of this discussion it should be assumed that the term atom includes ions.

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One more factor: Adding protons to the nucleus increases its charge and so the attraction between the nucleus and the electrons becomes stronger. As a result the atom radius decreases which plays a ro …
answered Jan 21 '15 by martinkunev