of: an atom (in a specified state, usually the ground state)
is: the minimum energy required to just remove the most weakly bound electron from the atom, and thereby to create a singly charged ion. [P8.2, P8.3, P8.4]
is also called: the first ionization energy of the atom. [P8.2, P8.3, P8.4]
is synonymous: with ionization potential. [P8.2]
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