Why does an increase in reaction temperature generally increase the reaction rate? the number of particles increases.
the energy required decreases.
the container warms up.
the number of collisions increases.

The number of collisions increase

Explanation: When temperature increases, that means the molecules move faster having a higher average kinetic energy. Therefore, the number of collisions increase.

distance, luminosity, brightness, radius, chemical composition, and temperature

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.