An atom is each sphere which are all connected
Aluminum can preserve food and drinks longer than iron can. If oxygen combines with the iron the iron will rust and the food or drink inside will not be good to eat anymore and you will have to waste it.
<em>Answer,</em>
<u><em>Propane's condensed structural formula is CH3 CH2 CH3. </em></u>
<u><em>Hope This Helps :-)</em></u>