[Kirkthejerk]

i have seen several videos and read comparisons between the size of the nucleus and the location of the 1s electrons. It is described in terms of the comparative size of the nucleus as a billiard ball with the first electrons ranging anywhere from 1/4 of a mile to one mile away. (In the classic Bohr model ) If this is "in the ballpark" why do TEM images of metallic / semi-metallic crystalline structures not reflect this? It seems unlikely that metallic bonding could account for this. Help?

[Borek]

Please elaborate - how do these images look like, and how you expect them to look?

[mjc123]

What causes the scattering of the beam electrons in making a TEM image?

[Enthalpy]

1s electrons "away" from the nucleus is wrong.

In a lone hydrogen atom, the probability density of a 1s electron per volume unit (not per radius unit) is maximum right at the nucleus. It decreases regularly with the distance without getting exactly zero, so to define some orbital radius, one needs to take a conventional limit, like "95% chances to find the electron within this volume".