first of all all materials on the earth are made of matter. matter is made of atoms. the difference between these two oxogens is that oxygen has a different amount of nuetrons in the cell's nucleus. this makes the two ogygens different. the 17 and 18 are the mass number of the two substances. that means that each cell has a specific number of nuetrons. the number of protons are always the same if the substance is the same. in this case they do have the same number of protons and electrons( substances always have the same number of electrons and protons) but they have different nuetrons. sorry for the long lecture but i felt a need to share my knolege
sincerly
professor Williams
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just difference
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Difference between it and what?
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