How would you construct a model to show the atomic structure for an oxygen atom?
Well, you have an oxygen ATOM,
So what does
Now the oxygen atom is neutral. Around the nuclear core, 8 electrons, 8 fundamental negatively charged particles of negligible mass are conceived to whizz about. To a first approx. modern views of electronic structure hold that the electrons are confined to various energy levels. Two electrons can fit into the first level, BUT up to 8 electrons can fit in the next available level(s). Since oxygen has got 6 electrons remaining, these electrons occupy the valence (outermost)shell of the of the oxygen atom, and the radius these electrons describe, define the atomic radius of ATOMIC oxygen.
Electronic interactions between different atoms can form chemical bonds.....for oxygen the most stable electronic arrangement occurs when a pair of such atoms make music to form a dioxygen molecule,
There are several ideas here and the associated alternate links: