What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

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.

Why do cells appear different in distilled water than they do in 10% salt water?