List the different parts of the periodic table that contain examples of exceptions to the aufbau principle. Analyze and explain why the electron configuration notation of Cm (curium) does not follow the aufbau principle and is an exception.

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answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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the answer is 75.0%.