What defines the mass number of an isotope? A. The sum of the neutrons and protons
B. The sum of the neutrons and electrons
C. The number of neutrons
D. The number of protons

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.

hypostyle hall;