Thank you very much Xray!!!
Indeed I wanted many times to get rid of the clouds but was too concentrated on the making of the atoms so I never learned where to disable the clouds. XD
No, in this scene I forgot to make electrons move in different directions with the photoelectric effect, so they can't simulate thermal energy. But I will try to add that feature later.
Guys, you should try this, it looks very beautiful: select the entire batch of initial particles, clone it and place the second one apart so you can select again only one of the 2 batches; play the scene without deselecting that batch, let the two batches fuse together, then press the "j" key for 30 seconds and enjoy the show.
Pretty neat how half of the particles look "energized" because they are selected, and adding the patterns in the background and the particle dynamics they all come together to make an amazing sight. 👌😎