The national government was too weak to solve the nation's problems.
The Articles of Confederation were only meant to be temporary, like a stand in, until a better document, eventually known as the constitution, could be created.
I’m pretty sure the answer is A because mass defect measure is the total binding of the energy that creates the nucleus
You would place it in orbit around Earth, as most X-rays are absorbed by the atmosphere, so you would want the detector outside of the atmosphere to accurately detect the X-rays.
Chemical substances can exist as solids, plasma, and gases so I guess it is none of the above.