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Hydrogen, Helium, and Lithium will follow a duet rule. This is because their electrons are present the 1s orbital, which is most stable when full (2 electrons). Hydrogen thus wants to gain an electron while Lithium wants to lose an electron in order to have the most stable electron configuration, which is that of Helium.
Not an exception to the octet rule, but to the typical electron configuration pattern - chromium and copper. They're [Ar]3d54s1 and [Ar]3d104s1 respectively, you just have to know that a half-filled or full d is more stable than a full s subshell.
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