Multiple ChoiceWhich isotope of platinum contains 118 neutrons? (Platinum has atomic number 78.)30views
Multiple ChoiceWhich element is represented by an atom with 13 protons and 14 neutrons (i.e., atomic number 13)?28views
Multiple ChoiceAn atom has 38 protons and 50 neutrons. What element is it (and what isotope is specified by these numbers)?25views
Multiple ChoiceHow many neutrons are in an atom of magnesium-25 (Mg-25)? (Atomic number of Mg is 12.)35views
Multiple ChoiceTin has atomic number 50. How many neutrons are in an atom of tin-120 (Sn-120)?27views