What is the role of an electron in an atom

Electrons give negative charge to the atom, and it balances out the positive charge given by the protons. That's the role of an electron!

Hope this helps!

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

the millers tale is the answer.