The section presents a question related to chemistry, specifically about identifying an element based on its atomic number. The key topics include:

- Atomic number and protons
- Elements and their corresponding atomic numbers

The entities involved are:

- The element with 26 protons, which is Iron (Sắt in Vietnamese).
- Other elements listed as options: Oxygen (Oxi), Copper (Đồng), and Gold (Vàng).

Summary: The section poses a question about identifying the element with 26 protons, with the correct answer being Iron (Sắt), while providing other options for consideration.