At like an atomic level, like really small, is it possible to determine where

At like an atomic level, like really small, is it possible to determine where

At like an atomic level, like really small, is it possible to determine where one thing stops and another begins? Say like where my finger stops and a key on my keyboard begins? (This might be a bad example, because a plastic key and my finger probably have quite different atoms, but still the line between them would be hard to find right.)

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