Select one: Atoms that have the same number of protons but a different number of neutrons. They are atoms of the same element that have different masses. The isotope number is the number of protons plus the number of neutrons. [iso- + Greek topos, place (so called because the isotopes of a chemical element occupy the same position in the periodic table of elements).] Insecticides Yes, I want to know more No, I prefer to remain blissfully unaware Please tell my neighbor, who may tell me Parcheesi On my honor I will do my best Testify Day Forecast Temp File subedit Document Submit Cancel OK Revert disabled Trunk of the tree Branch 1 Leaf A Leaf B Branch 2 Leaf C Leaf D