Final answer:
The element with an atomic number greater than Copper and less than Gallium is Zinc (atomic number 30). Zinc fits the criteria and is a group 12 element with a typical ns² outer shell configuration.
Step-by-step explanation:
The element being described has an atomic number greater than Copper (atomic number 29) but less than Gallium (atomic number 31). Based on the options provided and the given requirements, the answer is Zinc (atomic number 30), which falls between Copper and Gallium in the periodic table. Zinc is also in group 12 of the periodic table, where the group 12 elements, which include zinc, cadmium, mercury, and copernicium, have ns² as their outer shell electronic configuration (where 'n' stands for the principal quantum number).
Transition metals like silver, zinc, and cadmium form cations with fixed charges. Zinc forms cations with a charge of 2+ (Zn²+). This information corroborates that among the listed options, zinc matches the criteria specified in the question and is therefore the correct answer to the question.