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10 June, 20:09

18. When is an atom unlikely to react and form chemical bonds?

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  1. 10 June, 21:22
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    An atom is unlikely to react when its highest energy level has been filled.
  2. 10 June, 21:44
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    When it has a complete (full) outer shell of electron.

    For example helium is unreactive because it has 2 electrons in its outer (s shell)
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