CdSe 7 nm crystal
source: https://my.vanderbilt.edu/rosenthalresearch/

Single hydrogen atom electron potential
source: http://www.epsnews.eu/2013/06/quantum-microscope/

electron in orbital "d"
source: https://gifer.com/en/TPLm

"wave pattern" of 3p and 3d orbitals
source: https://archives.evergreen.edu/