If the available number of valence electrons for a molecule or polyatomic ion does not complete all of the octets in a lewis structure what should you do

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.