Other contributors have said "A atom thet gains an electron is called?" is the same question as "When an atom gains an electron it becomes a?" If you believe that these are not asking the same thing and should be answered differently, click here
When an atom gains an electron it becomes more negatively charged. If it was previously neutral, it becomes an ion with a -1 charge. If it was previously an ion with a +1 charge, then it becomes a...
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