Question
What is meant by ‘diffusion’? Give one example of diffusion in gases.
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During class, the students resemble molecules in a solid (because they are very close to one another)

While going from one classroom to another the students resemble molecules in a liquid (because they are a little more father apart from one another)
Calculate the number of neutrons present in the nucleus of an element X which is represented as $^{31}_{15}\text{X}.$