Who earned a nobel peace prize for their study of the photoelectric effect?

Idon’t understand this page, can someone ?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Describing intermolecular forces use the drop down menus to match the type of intermolecular force to its name dipole dipole interactions dipole induced dipole interactions london dispersion forces hydrogen bond van der waals forces done