Consider the diagram of the blast furnace given below. 
Answer the following questions with the numbers shown in the image.
-Iron ions form iron atoms in the area indicated by the number ______.
Definitions:
Environmental Protection Agency
A U.S. federal agency responsible for the regulation and enforcement of laws aimed at protecting human health and the environment.
Elevated Radon Levels
Refers to higher concentrations of radon gas in the atmosphere or in buildings, which is hazardous to health due to its radioactive properties.
Radioactive Isotopes
Atoms of the same element that have different numbers of neutrons and exhibit radioactivity by emitting radiation.
Belt of Stability
A graphical representation showing stable isotopes of elements; isotopes within the belt are more stable against radioactive decay.
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