Where were the elements that are found in nature formed

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Why is nh3 classified as a polar molecule

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.