What is the wavelength that has an energy of 4.90x10-19 J ? (Hint: Use algebraic manipulation to solve the energy equation for 2. You will get an answer in meters. Convert it to nanometers (10-m=1 nm).]
Express your answer with the appropriate units.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

i dont know the answe