Which noble gas has the same electron configuration as the nitrogen in an NH3 molecule

Which of these conditions most likely produces an unstable isotope?

Which substance has non polar covalent bonds

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.