Eli5 why is that an atom is 99,6 % empty space ?

Question

Eli5 why is that an atom is 99,6 % empty space ?

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Answer 1

I kind of think of an atom like our solar system. For simplicity say our solar system ends at Neptune. From the sun to Neptune is the “atom” but besides the planets and sun (and asteroids, etc..) the vast vast majority is basically an empty void. (Planets being electrons, sun being nucleus)