Scientific theories can change over time as new information is discovered if a scientific theory changes does this mean that it was not a good theory to begin with

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.

Which compound contain an iron with a 3+ charge