Question

multiple choice question
lons are formed when
o neutrons are ejected from the nucleus of an atom
o atoms either gain additional electrons or give up existing electrons
o electrons are shared between atoms
o additional protons are added to the nucleus of an atom
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Explanation:

Ions are formed when atoms gain or lose electrons. When an atom gains electrons, it becomes a negatively - charged ion (anion). When an atom loses electrons, it becomes a positively - charged ion (cation). Neutrons are neutral, and changing the number of neutrons affects the isotope of an atom, not ion formation. Sharing electrons between atoms forms covalent bonds, not ions. Adding protons to the nucleus changes the element itself, not form ions.

Answer:

atoms either gain additional electrons or give up existing electrons