Element X contains 4 electrons in its outer shell and 125 neutrons in its nucleus. what is element X? (beryllium/carbon/tin/lead)​

lead

Explanation:

As it is in group 4 so 4 electron In its outer shell

and you can find number of neutrons by taking

mass number - atomic number

207.2-82=124.2=125

hope it make sense:)

the correct answer is a

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.