Essential Chemistry for IGCSE - Structure And Bonding (Section 3 - No. 47)
In an ionic compound, what happens to the outer shell of an atom when it forms an ion?
It gains electrons to fill its outer shell.
It loses electrons, exposing the previous full shell.
It shares electrons with another atom.
It neither gains nor loses electrons
Explanation
When forming an ion, an atom either gains or loses electrons to achieve a full outer shell.
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