Changing the number of would change an atom into an atom of a different element. hints changing the number of would change an atom into an atom of a different element. electrons circling the nucleus of an atom bonds formed by an atom neutrons in an atom protons in an atom particles in the nucleus of an atom

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.