You can prove this by a DNA siblings test, it is the best way to prove a biological relationship
Carbon is 6
Iridium is 77
Helium is 2
Sulfur is 16 ( not sure)
Hydrogen is 1
So
Hydrogen
Helium
Carbon
Sulfur
Iridium
Sorry if I’m incorrect.
The natural spreading of particles through a liquid or gas is called diffusion