Sodium has the electronarrangement 2,8,1. Oxygen has the electron
arrangement 2,6. How many sodium atoms are needed for an oxygen
atom to get a full shell?

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