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Ions
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What is an ion?
An atom that has gained or lost electrons (so it has a charge).
Do protons change when forming ions?
No — only electrons change.
If an atom loses electrons, what charge does it get?
Positive (+) charge.
If an atom gains electrons, what charge does it get?
Negative (–) charge.
What is a cation?
A positive ion (loses electrons).
What is an anion?
A negative ion (gains electrons).
What ion does Na form?
Na⁺ (loses 1 electron)