An ion is formed when an atom:
ASplits in half
BGains or loses protons
CGains or loses neutrons
DGains or loses electrons
Answer & Solution
Correct answer: D. Gains or loses electrons
1. Ions carry a net electric charge.
2. Atoms become ions by changing their electron count.
3. Losing electrons gives a cation (positive ion).
4. Gaining electrons gives an anion (negative ion).
5. The nucleus (protons and neutrons) is normally unchanged.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_
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