In the very first shell it has 2 and then it has 6 (in the second shell). =)
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More energy have the electrons in the second level of energy.
An atom of oxygen has 2 energy levels that are occupied - the first energy level (K shell) can hold up to 2 electrons, and the second energy level (L shell) can hold up to 6 electrons. Oxygen has a total of 8 electrons.
each atom wants a full 8 of valance electrons it goes 2-8-8 oxygen as a neutral atom has has 8 electrons so oxygen has it like this 2-6 because that's all the electrons that's all the electrons it has.
More energy have the electrons in the second level of energy.
An atom's energy levels are occupied by electrons. Electrons occupy the energy levels, or electron shells, in order of increasing energy. The lowest energy level is filled first before electrons move to higher energy levels.