Multiple ChoiceAn atom has 38 protons and 50 neutrons. What element is it (and what isotope is specified by these numbers)?2views
Multiple ChoiceWhich of the following isotopes is not possible (i.e., would correspond to an element that cannot exist because its atomic number would be 0)?1views
Multiple ChoiceThallium has atomic number 81. How many neutrons are in an atom of thallium-205 (Tl-205)?1views