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Answer by Roger V. for Tell one atom from another
The possibility of switching between atoms does not mean that they are not identical. Even to the contrary: if they were not identical, they couldn't be switched. In my opinion, switching is better...
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It is said you can't tell one atom from another like you can't tell one electron from another, like Are atoms unique?, but:(1) Most physics about atom system is based on Born–Oppenheimer approximation...
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