The IUPAC name for Na2Cr2O7 is sodium dichromate. This compound contains sodium ions (Na+) and dichromate ions (Cr2O7^2-). The discussion highlights the importance of understanding oxidation numbers, which are crucial for naming and identifying chemical compounds. Sodium dichromate features chromium in a +6 oxidation state. The conversation concluded with the original poster confirming they received the answer they needed, indicating no further responses were required.