Tetrahedral
Octahedral
Trigonal planar
Trigonal bipyramidal
3 bondings + 1 electron pair = 4 (electron domains)
There are electron particles in O2 as well as in every thing in your body.
Because there are 2 bonded and 2 unbonded electron domains. since there are 4 electron domains, its original form would be a tetrahedral. however, for the molecular, you must remove to two unbonded domains, leaving the two domains as far apart from each other as possible
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The electron configuration for an O2- ion is 1s22s22p6 just like the noble gas neon.
O2 ADDED: Not O2, but one atom of oxygen.
The electron configuration of oxygen is [He]2s22p4.
An electron transport chain (ETC) couples a reaction between an electron donor (such as NADH) and an electron acceptor (such as O2