90 PARTICLES !
Energy
9 particles
There are 3 kinds of Sub-Atomic particles. These are Proton, Electron, Neutron.
Gas
Yes they do need particles to travel through!
Radiation does not need particles to transfer heat.
Lightning is formed by particles in the clouds, that on the top forms a Positive charge, and on the bottom a Negative charge, these particles continue to form, and when there are to many particles in the clouds, some need to go, and when they go, they come out as Static electricity, which this is called Lightning, and the more particles there are, the more will need to be given, and that means the more lightning there is.
At least two: 1 proton + 1 electron = Hydrogen atom
... particles.... particles.... particles.... particles.
alpha particles would have twice as many beta particles
90 PARTICLES !
Heat Radiation does not need a medium (particles of matter).
You need to know that one mole is 6.022 x 1023 particles (atoms, molecules, ions, formula units, etc...).
There are many kinds of particles and many kinds of motion, so there is more than one answer to that question. In many cases, particle motion is explained by Newtonian mechanics. In other cases, you would need quantum mechanics or Einstein's theory of relativity, or the Maxwell equations if the particles are photons.
1-4 particles
Cells need to get rid of large particles they don't need