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

Almost all of the mass in an atom is concentrated in the center of the atom in the nucleus, but the nucleus is actually quite small, and is relatively dense. The “”””empty”””” space comes from that being the region where the nucleus interacts with electrons.

I’m simplifying a bit here, but that empty space is being taken up by electrons, and the space where the electrons exist is way larger than the nucleus itself.