Can anyone help me with nomenclature?

Which of these conditions most likely produces an unstable isotope?

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

State one important difference between a physical change and a chemical change?