PLEASE HELP why is beta radiation used rather than alpha or gamma radiation in this paper thickness equipment?

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins