If an atom or a molecule gains an electron it will be

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BlackTom AI · Accepted Answer

The question asks about what happens when an atom or a molecule gains an electron. 
When an atom gains an electron, it acquires more negatively charged electrons than protons, resulting in a negative overall charge. In chemistry, a species with a negative charge is called an anion. 
If we consider the general outcomes: gaining electrons increases electron count and reduces the net positive charge, often leading to a more negative charge state; this is the defining feature of anions. 
In many multiple-choice setups, alternative answers would typically include terms like 'cation' (a positively charged ion formed by loss of electrons) or 'neutral atom' (no net charge), or other descriptors that imply a different charge state. However, since the provided options are not available in this case, we focus on the established consequence: electron gain yields an anion. 
Therefore, the correct characterization of an atom or molecule that has gained an electron is that it becomes an anion.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture 2 Quiz C01-1-3

If an atom or a molecule gains an electron it will be

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