An ion is formed when an atom
AAdds an extra shell of electrons
BGains a neutron in its nucleus
CLoses a proton from its nucleus
DGains or loses one or more electrons
Answer & Solution
Correct answer: D. Gains or loses one or more electrons
1. Atoms are electrically neutral overall.
2. When an atom loses electrons it becomes a positive ion (cation).
3. When it gains electrons it becomes a negative ion (anion).
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on ions_
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