What does the atomic number represents

Which element would mostly likely have an electron affinity measuring closest to zero

When a scientific theory has been tested and proved by the scientific community, it becomes a law

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car