Question

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atoms with unstable outer energy levels can
energy level.
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Explanation:

Atoms aim for a stable outer energy level (like having a full valence shell, often 8 electrons for many atoms). They can achieve this by giving away (losing) electrons (e.g., metals tend to lose electrons), taking in (gaining) electrons (e.g., non - metals can gain electrons), or sharing electrons (covalent bonding where atoms share electrons to complete their outer shells).

Answer:

lose, gain, share