Which element had the smallest atomic radius

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

What is the mass of each element in a 324.8 sample of co2