How can atoms with fewer than 8 valence electrons fill their outermost energy level?

Why is silver chloride is an ionic compound

Adilute aqueous potassium nitrate solution is

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.