Use the element above to answer the following question.

how many neutrons does lead have in one atom? (round your answer)

(hint: atomic mass - atomic number = # of neutrons)
question 8 options:

41

125

82

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.