Thread: If electrons became a little bit heavier than they are now, would you shrink or grow?

i thought it had something to do with the fact that the bohr radius decreases then thus smaller atoms -> smaller humans? but like i said that's just my hypothesis. not sure about it

yes. A meson may be captured in a atomic orbital Its orbital 'radius' is much smaller than an electron due to it's larger mass, just as you thought.

See K meson capture by Helium, where the idea was to obtain an atomic reaction as the meson has a large probability amplitude within the radius of the nucleus before it decays. (10^-8 sec. I don't think it worked usefully.)

Edit: See also Muon capture.

Great article in February Scientific American. The Proton Problem .
WRT to the OP here the article authors created a strange type of hydrogen. They removed the electron and replaced it with a muon. A muon is 200 times more massive than an electron and is thus 200 times closer to the proton. It is also 8 million times more often in the proton.

The article focuses in there is a significant difference in proton size depending on the measurement methods. 0.841 femtometer vs 0.876 femtometer.